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Tytuł:
The Continuous Growth of Bulk Si by Temperature Gradient Zone Melting Method
Autorzy:
Li, Jiayan
Wang, Liang
Hao, Jianjie
Ni, Ping
Tan, Yi
Powiązania:
https://bibliotekanauki.pl/articles/356541.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk Si
TGZM
Si-Al alloy
growth rate
impurities
Opis:
Temperature gradient zone melting (TGZM) method was used to obtain bulk Si continuously for the efficient separation and purification of primary Si from the Si-Al alloy in this work. The effects of alloy thickness, temperature gradient and holding time in TGZM purification technology were investigated. Finally, the continuous growth of bulk Si without eutectic inclusions was obtained. The results showed that the growth rate of bulk Si was independent of the liquid zone thickness. When the temperature gradient was changed from 2.48 K/mm to 3.97 K/mm, the growth rate of bulk Si was enhanced from 7.9×10-5 mm/s to 2.47×10-4 mm/s, which was increased by about 3 times. The bulk Si could grow continuously and the growth rate was decreased with the increase of holding time from 1 h to 5 h. Meanwhile, low refining temperature was beneficial to the removal of impurities. With a precipitation temperature of 1460 K and a temperature gradient of 2.48 K/mm, the removal rates of Fe, P and B were 99.8%, 94.0% and 63.6%, respectively.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 271-278
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation of Hardness and Silicon Morphology for Al-Si-Sb Alloy
Autorzy:
Uzun, O.
Yilmaz, F.
Emeksiz, C.
Ergen, S.
Kolemen, U.
Powiązania:
https://bibliotekanauki.pl/articles/356738.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
casting
Vickers
finite element analysis
Opis:
In this study, we have focused on the role of silicon morphology on the hardness of eutectic Al–12 wt.% Si–0.5 wt.% Sb alloy solidified at different cooling rates. The alloys were produced by using induction melting, arc-remelting and melt-spinning techniques. The cooling rates of the alloys were determined as 0.5, 60 and ~105°C.s-1 for induction-melted, arc-remelted and meltspun alloy. The experimental results show that as the cooling rate increased the coarse silicon phase was substantially refined and its morphology altered from sharp need-like to round shape. Two exothermic peaks, attributed to precipitation and coarsening of silicon from supersaturated α-Al, were observed in the DSC curve of MS alloy. Vicker’s hardness of melt-spun alloy was found two times higher than those of IMed and ARed alloys. The lowest hardness of induction-melted alloy was ascribed to the lamellar morphology of silicon, yielding decohesive rupture. This result was confirmed by finite element analyzing.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 467-472
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Modifier on the Microstructure of the AlSi10CuNiMn Alloy
Autorzy:
Cais, Jaromir
Heinrich, Jiri
Jirounkova, Klara
Powiązania:
https://bibliotekanauki.pl/articles/103309.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Al-Si alloy
microstructure
modification
microscopy
stop Al-Si
mikrostruktura
modyfikacja
mikroskopia
Opis:
This paper deals with different types of modifiers and their effect on the microstructure of the Al-Si alloy. For the purposes of this research, strontium, antimony and calcium were used as the modifiers of the AlSi10CuNiMn alloy. Unmodified alloy was cast in order to be compared with the alloy modified by different modifiers in various concentrations. The results of this research were analysed via light and electron microscopy.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 2; 13-18
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metallurgical Processing of Al-Si Alloys with Increased Iron Content Using Sodium, Strontium, and Tellurium
Autorzy:
Pokusová, M.
Berta, I.
Murgašová, M.
Powiązania:
https://bibliotekanauki.pl/articles/106931.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Al-Si alloy
iron
metallurgical processing
sodium
tellurium
strontium
Opis:
This paper presents the results of research focused on the processing of the hypoeutectic Al-Si alloy with an increased iron content of 1.75 wt.%. The physical-metallurgical method was used to eliminate the undesirable effect of the iron rich b-phase on the mechanical properties of the casting material using liquid metal modification by strontium, sodium, and tellurium. The chemical composition of an experimental material didn’t contain any elements for the solid-solution strengthening of a matrix; therefore, the presented results can document the capabilities of modifying the b-phase under a minimum influence on the properties of the basic Al-Si system.
Źródło:
Journal of Casting & Materials Engineering; 2018, 2, 1; 9-13
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Crystallization of the AlSi9 Alloy Designed for the Alfin Processing of Ring Supports in Engine Pistons
Autorzy:
Piatkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/947636.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si cast alloy
alfin processing
crystallization
microstructure alloys
Opis:
This article presents a study of the crystallization and microstructure of the AlSi9 alloy (EN AC-AlSi9) used for the alfin processing of iron ring supports in castings of silumin pistons. Alfin processing in brief is based on submerging an iron casting in an Al-Si bath, maintaining it there for a defined time period, placing it in a chill mould casting machine and immersing it in the alloy. This technology is used for iron ring supports in the pistons of internal combustion engines, among others. Thermal analysis shows that when the AlSi9 alloy contains a minimal content of iron, nucleation and increase in the triple α (Al)+Fe+(Si) eutectic containing the α -Al8Fe2Si phase takes place at the end of the crystallization of the double α (Al)+ß(Si) eutectic. Due to the morphology of the ”Chinese script” the -Al8Fe2Si phase is beneficial and does not reduce the alloy’s brittleness. After approx. 5 hours of alfin processing, the -Al5FeSi phase crystallizes as a component of the α+Al5FeSi+(Si) eutectic. Its disadvantageous morphology is ”platelike” with sharp corners, and in a microsection of the surface, ”needles” with pointed corners are visible, with increases the fragility of the AlSi9 alloys.
Źródło:
Archives of Foundry Engineering; 2020, 20, 2; 65-70
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Eutectic Formation in Al-Si Alloy Using A Phase-Field Method
Autorzy:
Ebrahimi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353792.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase-field model
Al-Si alloy
eutectic growth
fluctuations
Opis:
We have utilized a phase-field model to investigate the evolution of eutectic silicon in Al-Si alloy. The interfacial fluctuations are included into a phase-field model of two-phase solidification, as stochastic noise terms and their dominant role in eutectic silicon formation is discussed. We have observed that silicon spherical particles nucleate on the foundation of primary aluminum phase and their nucleation continues on concentric rings, through the Al matrix. The nucleation of silicon particles is attributed to the inclusion of fluctuations into the phase-field equations. The simulation results have shown needle-like, fish-bone like and flakes of silicon phase by adjusting the noise coefficients to larger values. Moreover, the role of primary Al phase on nucleation of silicon particles in Al-Si alloy is elaborated. We have found that the addition of fluctuations plays the role of modifiers in our simulations and is essential for phase-field modeling of eutectic growth in Al-Si system. The simulated finger-like Al phases and spherical Si particles are very similar to those of experimental eutectic growth in modified Al-Si alloy.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 1969-1981
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Semisolid and Strontium Addition on Dry Sliding Wear Behavior of Hypoeutectic Al-Si Alloy
Autorzy:
Anas, Noraz Man
Zakaria, S. A.
Anasyida, A. S.
Mohamad, Hasmaliza
Dhindaw, Brij Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2203750.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypoeutectic Al-Si alloy
semisolid
cooling slope
Sr
wear resistance
Opis:
The study aims to investigate the effect of semisolid structure and strontium (Sr) addition on the wear behavior of hypoeutectic Al-Si alloy. Semisolid hypoeutectic Al-Si alloy was prepared using cooling slope casting with addition of 0 to 0.93 wt.% Sr. Microstructural study was done using an optical microscope. Vicker microhardness and pin on disc tribometer were used for microhardness and wear testing. When compared to conventional casting, the microhardness of the semisolid hypoeutectic Al-Si alloy improved by 9.8%. Sr addition at 0.43 wt.% resulted in a refined eutectic structure with a 17% increase in hardness over conventional casting. The globular structure α-Al formed during semisolid casting reduced porosity, and the addition of Sr refined the eutectic silicon into a fine fibrous structure that is tightly bound with the Al matrix. These are the primary factors that contribute to the high wear resistance in modified-Sr semisolid alloys.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 307--317
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer-aided analysis of a new process for flanging hollow parts
Autorzy:
Winiarski, G.
Powiązania:
https://bibliotekanauki.pl/articles/118231.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
flanging
hollow parts
Al-Mg-Si alloy
FEM
Opis:
The paper presents a new process for flanging hollow parts. This process is performed using a specially designed set of tools with movable sleeves. The principle of operation of the tool set is described and examples of the numerical analysis results are given. The FEM simulation was performed on the assumption that the hot-formed hollow workpiece (tube) is made of AlMgSi aluminum alloy. The obtained FEM results show changes in the workpiece shape during flanging, variations in the forming force and the damage function distribution computed according to the C-L failure criterion. The theoretical results of the new flanging method provided basis for experimental tests.
Źródło:
Applied Computer Science; 2014, 10, 1; 19-29
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modifications ALSI7MG0.3 alloys trough CA, SR and SB
Autorzy:
Cais, Jaromír
Lysoňková, Irena
Kraus, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/102369.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Al-Si alloy
modifier
microstructure
EDX analysis
stop Al-Si
modyfikator
mikrostruktura
analiza EDX
Opis:
This article deals with examing the effect of modifier on changes in microstructure of the alloy AlSi7Mg0.3. The content of the experiment was to examine the effect of addition of calcium, stroncium, and antimony to change the morphology of the eutectic silicon in the alloy type of Al-Si (namely AlSi7Mg0.3). Besides changes in the morphology of eutectic silicon was explored focused on character exlusion modifiers within microstructure of the modified alloy. Examination of the microstructure was realized by scanning electron microscopy and complemented by EDX analysis of the examined samples.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 2; 180-187
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Bending Fatigue Properties of Al-Si Cast Alloy
Autorzy:
Tillová, E.
Závodská, D.
Kuchariková, L.
Chalupová, M.
Belan, J.
Powiązania:
https://bibliotekanauki.pl/articles/355910.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
secondary Al-Si cast alloy
fatigue properties
fracture
cast defects
Opis:
Fatigue properties of casting Al-alloys are very sensitive to the microstructural features of the alloy (e.g. size and morphology of the eutectic Si, secondary dendrite arm spacing – SDAS, intermetallics, grain size) and casting defects (porosity and oxides). Experimental study of bending fatigue properties of secondary cast alloys have shown that: fatigue tests up to 106-107cycles show mean fatigue limits of approx. 30-49 MPa (AlSi9Cu3 alloy – as cast state), approx. 65-76 MPa (AlSi9Cu3 alloy after solution treatment) and 60-70 MPa (self-hardened AlZn10Si8Mg alloy) in the tested casting condition; whenever large pore is present at or near the specimen’s surface, it will be the dominant cause of fatigue crack initiation; in the absence of large casting defects, the influence of microstructural features (Si morphology; Fe-rich phases) on the fatigue performance becomes more pronounced.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1591-1596
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Role of Microstructure on the Corrosion Behaviour of as cast AlCu4MgSi and MgAl2Si Alloys
Autorzy:
Lachowicz, M. M.
Jasionowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/381379.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
corrosion resistance
aluminum alloy
magnesium alloy
Al-Cu-Mg-Si alloy
Mg-Al-Si alloy
metalografia
odporność korozyjna
stop aluminium
stop magnezu
stop Al-Cu-Mg-Si
stop Mg-Al-Si
Opis:
In this work, the effect of the microstructure on corrosion behavior of selected Mg- and Al-based as cast alloys, was evaluated. The electrochemical examinations were carried out, and then a morphology of corrosion products formed due to local polarization on materials surface, was analyzed. It was documented that the presence of Mg2Si phase plays an important role in the corrosion course of Mg-based alloy. A selective etching was observed in sites of Mg2Si precipitates having “Chinese script”- like morphology. Analogous situation was found for Al-based alloy, where the key role was played by cathodic θ-CuAl2 phase.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 125-130
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combustion Engine Cylinder Liners Made of Al-Si Alloys
Autorzy:
Orłowicz, A. W.
Tupaj, M.
Mróz, M.
Trytek, A.
Powiązania:
https://bibliotekanauki.pl/articles/382953.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combustion engine
cylinder liner
Al-Si alloy
silnik spalinowy
tuleja cylindrowa
stop Al-Si
Opis:
The paper deals with problems related to application of aluminum-silicon alloys for combustion engine cylinder liners.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 71-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of Al-Si Alloy Fatigue Strength by Means of Refining and Modification
Autorzy:
Tupaj, M.
Orłowicz, A. W.
Trytek, A.
Mróz, M.
Powiązania:
https://bibliotekanauki.pl/articles/379844.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
fatigue limit
refining
modification
stop Al-Si
granica zmęczenia
rafinacja
modyfikacja
Opis:
The paper presents results of a study concerning an AlSi7Mg alloy and the effect of subjecting the liquid metal to four different processes: conventional refining with hexachloroethane; the same refining followed by modification with titanium, boron, and sodium; refining by purging with argon carried out in parallel with modification with titanium and boron salts and strontium; and parallel refining with argon and modification with titanium, boron, and sodium salts. The effect of these four processes on compactness of the material, parameters of microstructure, and fatigue strength of AlSi7Mg alloy after heat treatment. It has been found that the highest compactness (the lowest porosity ratio value) and the most favorable values of the examined parameters of microstructure were demonstrated by the alloy obtained with the use of the process including parallel purging with argon and modification with salts of titanium, boron, and sodium. It has been found that in the fatigue cracking process observed in all the four variants of the liquid metal treatment, the crucial role in initiation of fatigue cracks was played by porosity. Application of the process consisting in refining by purging with argon parallel to modification with Ti, B, and Na salts allowed to refine the microstructure and reduce significantly porosity of the alloy extending thus the time of initiation and propagation of fatigue cracks. The ultimate effect consisted in a distinct increase of the fatigue limit value.
Źródło:
Archives of Foundry Engineering; 2019, 4; 61-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Water Mist Cooling of Casting Die on the Solidification, Microstructure and Properties of AlSi20 Alloy
Autorzy:
Władysiak, R.
Kozuń, A.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/353825.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silicon dendrites
casting die cooling
water mist
hypereutectic Al-Si alloy
Opis:
Unmodified AlSi20 alloy were casted at the research station, allowing for sequential multipoint cooling using a dedicated computer- controlled program. This method allows for the formation of the microstructure of hypereutectic AlSi20 alloy and also increases hardness. Primary silicon dendrites were found in the microstructure of cooled samples. Based on these dendrites, the formation of primary silicon particles is explained. Cooling of casting die with a water mist stream causes changes in solidification, which leads to expansion of the boundary layer with columnar crystals and shrinkage of the core zone with equiaxed crystals. It also causes more regular hardness distribution around pre-eutectic Si crystals, which can lead to tensile strength and machinability improvement.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 187-194
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Trace Elements (Co, Cr) on the Microstructure and Physical Properties of Al-Si-Cu-Mg-Fe Extruded Alloy
Autorzy:
Ahn, S. S.
Sharief, P.
Lee, C. H.
Son, H. T.
Kim, Y. H.
Kim, Y. C.
Hong, S.
Hong, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/352787.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
microstructure
extrusion
coefficient of thermal expansion
trace elements
Opis:
Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence wereconfirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5 FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 857-862
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Modification of Al-6%Si By Semisolid Process
Autorzy:
Sarajan, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353078.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
Al-6%Si Alloy
stirring
morphology
semisolid process
Opis:
In this study by semisolid processing of Al-6%Si alloy, it has been found that small additions of Ti-6Al-4V shift the liquidus temperature up and the recalescence decreases. The nucleation event takes place at higher temperatures. Furthermore, the rate at which growth temperature increases is less than that of nucleation temperature and therefore more nuclei form with less potential for growth. In this processing refiner increases the α-Al percentage and reduces globule size. Improvement of mechanical property and microstructure characterization are the main advantages of this study.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1689-1696
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cooling Rate on Intergranular Corrosion in Al-Si7-Mg Alloy
Autorzy:
Bernat, L.
Powiązania:
https://bibliotekanauki.pl/articles/381720.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si-Mg alloy
intergranular corrosion
cooling rate
stop Al-Si-Mg
korozja międzykrystaliczna
szybkość chłodzenia
Opis:
The use of aluminium cast alloys in automotive industry results from a tendency to considerably lower vehicle mass. Subject to working conditions, silumin casts may show occurrence of intergranular corrosion that reduces mechanical properties of the parts produced. The paper presents the influence of cooling rate – R of a plate cast of aluminium alloy EN AC-AlSi7Mg0,3 on the depth of appearance of intergranular corrosion. Samples were exposed to corrosive medium by immersion for 2,5; 12; 24 and 48 hours in an aqueous solution of NaCl+HCl+H2O. The study demonstrated that cooling rate – R and subsurface porosity significantly influence on distribution and depth of intergranular corrosion in casts of subeutectic silumin.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 107-111
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma Coatings on Aluminium-Silicon Alloy Surfaces
Autorzy:
Długosz, P.
Garbacz-Klempka, A.
Piwońska, J.
Darłak, P.
Młynarczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2079836.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plasma coating
Al-Si alloy
plasma oxidation
anodizing
powłoki plazmowe
stop Al-Si
utlenianie plazmowe
anodowanie
Opis:
Plasma oxidation, similarly to anodic oxidation (anodizing), are classified as electrochemical surface treatment of metals such as Al, Mg, Ti and their alloys. This type of treatment is used to make surface of castings, plastically processed products, shaped with incremental methods to suitable for certain requirements. The most important role of the micro plasma coating is to protect the metal surface against corrosion. It is well known that coating of aluminium alloys containing silicon using anodic oxidation causes significant difficulties. They are linked to the eutectic nature of this alloy and result in a lack of coverage in silicon-related areas. The coating structure in these areas is discontinuous. In order to eliminate this phenomenon, it is required to apply oxidation coatings using the PEO (Plasma Electrolytic Oxidation) method. It allows a consistent, crystalline coating to be formed. This study presents the mechanical properties of the coatings applied to Al-Si alloy using the PEO method. As part of the testing, the coating thickness, microhardness and scratch resistance were determined. On the basis of the results obtained, it was concluded that the thickness of the coatings complies with the requirements of conventional anodizing. Additionally, microhardness values exceeded the results obtained with standard methods.
Źródło:
Archives of Foundry Engineering; 2021, 21, 3; 96-101
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Casting pore characterization by X-ray computed tomography and metallography
Charakteryzacja porów odlewniczych metodami rentgenowskiej tomografii komputerowej i metalografii
Autorzy:
Fintová, S.
Anzelotti, G.
Konečná, R.
Nicoletto, G.
Powiązania:
https://bibliotekanauki.pl/articles/139863.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zmęczenie
techniki metalograficzne
stopy Al-Si
tomografia rentgenowska
fatigue
metallographic techniques
Al-Si alloy
X-ray tomography
Opis:
Casting porosity is the main factor influencing the fatigue properties of Al-Si alloys. Due to the increasing use of aluminum castings, porosity characterization is useful for estimating their fatigue strength. In principle, a combination of metallographic techniques and statistical pore analysis is a suitable approach for predicting the largest defect size that is critical for the casting. Here, the influence of modifiers and casting technology on the largest pore size population in AISi7Mg alloy specimens is obtained and discussed adopting the Murakami's approach. However, porosity evaluation is a challenge in the case of microshrinkage pores, which are frequently found in industrial castings. Their complicated morphology prevents a reliable definition of an equivalent defect size based on metallographic techniques. This contribution reports the application of X-ray tomography to the 3D reconstruction of real pores in cast Al-Si alloys and provides insight into the complication of microshrinkage pore sizing by metallography.
Porowatość odlewów jest głównym czynnikiem wpływającym na właściwości wytrzymałościowe stopów Al-Si. Z uwagi na rosnące zastosowanie odlewów aluminiowych, charakteryzacja ich porowatości nabiera znaczenia dla oceny wytrzymałości zmęczeniowej. Uważa się, że właściwym podejściem jest zastosowanie kombinacji technik metalograficznych i statystycznej analizy porów, co umożliwia przewidywanie największego, krytycznego dla odlewu, rozmiaru defektów. W tej pracy wyznaczano i dyskutowano wpływ modyfikatorów i technologii odlewania na największy rozmiar populacji porów w próbkach stopu AlSi7Mg, przyjmując podejście Mirakami'ego. Ocena porowatości staje się jednak wyzwaniem w przypadku porów związanych z. mikrokurczliwością, które występują często w odlewach przemysłowych. Ich skomplikowana morfologia powoduje, że trudno jest wiarygodnie zdefiniować równoważny rozmiar defektu w oparciu o techniki metalograficzne. Przedstawione doniesienie zawiera opis zastosowania rentgenowskiej tomografii komputerowej do trójwymiarowej rekonstrukcji rzeczywistych porów w odlewie ze stopu AISi i daje pogląd na temat komplikacji w wymiarowaniu porów związanych z mikrokurczliwością metodami metalograficznymi.
Źródło:
Archive of Mechanical Engineering; 2010, LVII, 3; 263-273
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of AlSi21CuNi alloy’s quality with use of ATND method
Autorzy:
Pezda, J.
Powiązania:
https://bibliotekanauki.pl/articles/380515.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypereutectic Al-Si alloy
modification
ATND
mechanical properties
stop nadeutektyczny Al-Si
modyfikacja
metoda ATND
właściwości mechaniczne
Opis:
Majority of combustion engines is produced (poured) from Al-Si alloys with low thermal expansion coefficient, so called piston silumins. Hypereutectic alloys normally contain coarse, primary angular Si particles together with eutectic Si phase. The structure and mechanical properties of these alloys are highly dependent upon cooling rate, composition, modification and heat-treatment operations. In the paper one depicts use of the ATND method (thermal-voltage-derivative analysis) and regression analysis to assessment of quality of the AlSi21CuNi alloy modified with Cu-P on stage of its preparation, in aspect of obtained mechanical properties (R0,02, Rm, A5, HB). Obtained dependencies enable prediction of mechanical properties of the investigated alloy in laboratory conditions, using values of characteristic points from curves of the ATND method.
Źródło:
Archives of Foundry Engineering; 2013, 13, 4; 87-92
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Resistance of A390.0 Alloy Modified with Phosphorus
Autorzy:
Wieszała, R.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/381178.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue wear
unilateral pulsating vibration
hypereutectic Al-Si alloy
zużycie zmęczeniowe
drganie pulsacyjne
stop nadeutektyczny Al-Si
Opis:
The paper presents fatigue tests (unilateral pulsating vibrations) for hypereutectic silumin AlSi17Cu5Mg aimed at simulation of deflection of the piston head in a combustion engine. The methodology of the tests and the way of marking the deflection of the tested material is described together with the detailed description of the test stand. The fatigue resistance ZG was identified in the tested material and a Wöhler diagram was prepared to show the areas of limited and unlimited fatigue resistance.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
Autorzy:
Piątkowski, J.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/382327.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypereutectic Al-Si alloy
overheating
thermal analysis
crystallization process
stop nadeutektyczny Al-Si
przegrzanie
analiza termiczna
proces krystalizacji
Opis:
In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
Źródło:
Archives of Foundry Engineering; 2015, 15, 1; 83-86
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Remelting on Microstructure of the AlSi9Cu3 Alloy with Higher Iron Content
Autorzy:
Matejka, M.
Bolibruchova, D.
Powiązania:
https://bibliotekanauki.pl/articles/380982.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
heat treatment
Al-Si-Cu alloy
remelting effect
metalografia
obróbka cieplna
stop Al-Si-Cu
efekt przetapiania
Opis:
Secondary or multiple remelted alloys are common materials used in foundries. For secondary (recycled) Al-Si-Cu alloys, the major problem is the increased iron presence. Iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which may negatively affect the structure. The paper deals with effect of multiple remelting on the microstructure of the AlS9iCu3 alloy with increased iron content to about 1.4 wt. %. The evaluation of the microstructure is focused on the morphology of iron-base intermetallic phases in caste state, after the heat treatment (T5) and after natural aging. The occurrence of the sludge phases was also observed. From the obtained results can be concluded that the multiple remelting leads to change of chemical composition, changes in the final microstructure and also increases sludge phases formation. The use of heat treatment T5 led to a positive change of microstructure, while the effect of natural aging is beneficial only to the 3rd remelting.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 25-30
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Liquid Aluminium Alloys at Particular Stages of Manufacturing Process
Badanie ciekłych stopów aluminium na poszczególnych etapach procesu technologicznego
Autorzy:
Dzik, St.
Targowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/351184.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloy
degassing
metal testing
inoculation to grain refining
stop Al-Si
odgazowanie
rozdrabnianie ziarna
badanie metali
Opis:
Requirements, placed by design engineers in relation to special castings, applied to gas filled high voltage switchgears PN-EN 50052:2002, are still higher. These demands concern to quality of machined sealing surface, assurance of castings leaktightness for a long time of operating and suitable strength during special bursting test. Manufacturer of such castings is obliged to use, among other things, high quality new alloy and guarantee proper metallurgical treatment and liquid alloy control during metal melting and preparation, before filling the moulds. Generally new alloy testing is made by its producer. Receiver checks testing results, according to effective procedures, during incoming inspection. Following tests are carried out during liquid alloy preparation (melting, degassing and inoculation): chemical composition test, thermal analysis and density index. To confirm that the process of liquid alloy control is correct comparative examinations were made, using new installations of companies such as Foseco, ALSPEK* H, and metallographic examinations of special samples with computer picture analysis. All examinations were made for one heat of AlSi7Mg0.3 alloy (AC - 42100 according to PN-EN 1706:2011), at different stages of liquid metal preparation, such as: in melting furnace, after reladle, after refining and just before filling sand moulds. Additionally alloy purity index, hydrogen content in liquid alloy, porosity degree were determined and also analysis of inclusions was made. Examinations with applying modern devices confirmed, that the process of preparation and testing of liquid alloy, intended to produce castings of special requirements, is correct. All applied refining treatments improved liquid alloy quality, eliminated number of inclusions, porosity and reduced hydrogen content. It is a base for stating that high quality alloy, correctly prepared and controlled before filling sand mould was used. New Foseco devices can be used in foundries to verify their processes of alloy preparation and alloy purity evaluation on different stages, especially producing castings of high technical requirements. The thixotropy phenomenon is strongly connected with the change of viscosity in time, while the of Navier-Stockes equation. The micro- and macroscale models are coupled using CAFE approach.
Konstruktorzy stawiają coraz wyższe wymagania dla specjalnych odlewów stosowanych w wysokonapięciowych roz- dzielniach napełnianych gazem (PN-EN 50052:2002). Wymagania dotyczą jakości powierzchni uszczelniających po obróbce mechanicznej, zapewnienia szczelności odlewów w długim okresie ekspolatacji oraz odpowiedniej wytrzymałości w specjalnej próbie na rozrywanie. Dla producenta takich odlewów niezbędne jest stosowanie między innymi wysokiej jakości stopów wyjściowych oraz zapewnienie w procesie produkcyjnym topienia i przygotowania właściwej obróbki metalurgicznej oraz kontroli ciekłego stopu, jeszcze przed zalaniem form. Powszechnie stosowane są badania jakości materiału wsadowego przez producenta Odbiorca sprawdza wyniki badań w czasie kontroli wejściowej w ramach obowiązujących procedur. W trakcie przygotowania ciekłego stopu (topienie, rafinacja, modyfikacja) przeprowadzane są badania składu chemicznego, wykonywana jest analiza termiczna stopuoraz określony indeks gęstości. Dla sprawdzenia poprawności stosowanego procesu kontroli ciekłego stopu dokonano pełniejszych badań porównawczych z zastosowaniem nowych urządzeń firmy Foseco. Alspek*H, Alspek MQ oraz badań metalograficznych na specjalnych próbkach z zastosowaniem komputerowej analizy obrazu. Badania przeprowadzono dla jednego wytopu stopu AlSi7MgO,3 (AC - 42100 wg PN-EN 1706:2011) w różnych etapach przygotowania, tj. w piecu topialnym. po przelaniu do kadzi przewoźnej, po procesie uszlachetniania oraz bezpośrednio przed zalaniem do form piaskowych. Dodatkowo określono indeks czystości stopu, zawartość wodoru w ciekłym stopie a także wykonano analizę wtrąceń i określono stopień porowatości. Wyniki badan przeprowadzone z zastosowaniem nowych urządzeń potwierdziły prawidłowość stosowanej technologii przygotowania i badania ciekłego stopu przeznaczonego na odpowiedzialne odlewy o specjalnych wymaganiach. Stosowane zabiegi uszlachetniania poprawiają w kolejnych zabiegach jakość ciekłego stopu, eliminują ilość wtrąceń, porowatość i zmniejszają zawartość wodoru. Daje to podstawę do oceny, że stosuje się dobrej jakości stop wyjściowy, jest on przygotowany i skontrolowany przed zalaniem formy piaskowej. Nowe urządzenia firmy Foseco mogą być przydatne w odlewniach do weryfikacji stosowanego procesu przygotowania stopu i oceny jego czystości na różnych etapach, zwłaszcza produkujących odlewy o wysokich wymaganiach technicznych.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 397-402
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chosen Aspects of Quality Defects of ”Alphin” Inserts in Combustions Pistons
Autorzy:
Piątkowski, J.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/381700.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si casting alloy
quality defect
alphin inserts
motor piston
stop odlewniczy Al-Si
wada jakości
tłok silnikowy
Opis:
The chosen, typical causes of quality defects of cast-iron „alphin” rings embedded in aluminum cast are being presented in this paper. Diffusive joint of those inserts with the pistons casts is being used, due to extreme work conditions of destructive influence of the fuel mix and variable thermo-mechanical loads, which reign in the combustion motor working chamber.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4; 61-64
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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