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Wyświetlanie 1-15 z 247
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:
Study of Mechanical Properties and Precipitation Reactions in Low Copper Containing Al-Mg-Si Alloy
Autorzy:
Belghit, H.
Farh, H.
Ziar, T.
Zidani, M.
Guemini, M.
Powiązania:
https://bibliotekanauki.pl/articles/354817.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Mg-Si alloys
precipitation
DSC
TEM
excess Si
copper
Opis:
The scope of this work is to investigate the precipitation of two Al-Mg-Si alloys with and without Cu and excess Si by using the differential scanning calorimetry (DSC), transmission electron microscopic (TEM), Vickers hardness measurement and X-ray diffraction. The analysis of the DSC curves found that the excess Si accelerate the precipitation and the alloy contain the excess Si and small addition of copper has higher aging-hardness than that of free alloy (without excess Si and Cu) at the same heat treatment condition. The sufficient holding time for the precipitation of the β'' phase was estimated to be 6 hours for the alloy aged at 100°C and 10 hours for the alloy aged at 180°C. The low Copper containing Al-Mg-Si alloy gives rise to the forming a finer distribution of β (Mg2Si) precipitates which increases the hardness of the alloy. In order to know more about the precipitation reactions, concern the peaks on the DSC curve transmission electron microscopy observation were made on samples annealed at temperatures (250°C, 290°C and 400°C) just above the corresponding peaks of the three phases β'', β' and β respectively.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1643-1648
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:
The CRO Laudato Si’ Project: Goals, Activities, and Social Outcomes
Projekt CRO Laudato Si’: cele, działania i rezultaty społeczne
Autorzy:
Brgles, Miriam Mary
Turza, Zoran
Žagmešter, Marija
Powiązania:
https://bibliotekanauki.pl/articles/1991268.pdf
Data publikacji:
2022-01-05
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
projekt CRO Laudato Si’
Encyklika Laudato Si’
papież Franciszek
środowisko
społeczeństwo
badania ankietowe
CRO Laudato Si’ project
Encyclical Letter Laudato Si’
Pope Francis
environment
society
survey research
Opis:
On the eve of 2020, and the fifth anniversary of the publication of the Encyclical Letter - Laudato Si’. On the care for the common home at the Catholic University of Croatia, the scientific-professional project CRO Laudato Si’ was launched. The project team was composed of scientists from different disciplines, and the project partners were the National Fraternity of the Franciscan Secular Order and the Franciscan Youth. As part of the project, scientific and practical activities were carried out. One of the main scientific activities was empirical scientific research, which was conducted, using a survey method over several months in 2020. The paper will present the results of the research, related to the role of the project in the knowledge of the encyclical Laudato Si’ and the awakening of interest in the encyclical, according to the socio-demographic characteristics of the respondents. The results show that men have heard of the encyclical Laudato Si’ to a somewhat greater extent than women. The largest number of respondents, who heard about the encyclical for the first time through the project, are those who belong to the youngest age group, followed by those with high school education. Arousing interest in Encyclical Letter topics is more encouraged among women, those over 65 years old, respondents with completed primary school, and those who are self-employed or retired.
U progu 2020 roku, w piątą rocznicę opublikowania encykliki Laudato Si’. W trosce o wspólny dom na Katolickim Uniwersytecie Chorwacji zapoczątkowano projekt naukowo-zawodowy CRO Laudato Si’. Zespół projektowy składał się z naukowców z różnych dyscyplin, a partnerami projektu była Wspólnota Narodowa Świeckiego Zakonu Franciszkańskiego oraz Młodzież Franciszkańska. W ramach projektu prowadzono działania naukowe i praktyczne. Jednym z głównych działań naukowych były empiryczne badania, przeprowadzone metodą ankietową w okresie kilku miesięcy w 2020 roku. W artykule zostały przedstawione wyniki badań związanych z rolą projektu na temat znajomości encykliki Laudato Si’ oraz rozbudzanie zainteresowania encykliką uwzględniając społeczno-demograficzny charakter respondentów. Wyniki badań wskazują, że mężczyźni słyszeli o encyklice Laudato Si’ w nieco większym stopniu niż kobiety. Najwięcej respondentów, którzy w ramach projektu po raz pierwszy usłyszeli o encyklice, to ci, którzy należą do najmłodszej grupy wiekowej, a następnie osoby z wykształceniem średnim. Zainteresowanie tematyką encykliki jest wyższe wśród kobiet, osób powyżej 65 roku życia, respondentów z ukończoną szkołą podstawową oraz osób samozatrudnionych lub emerytów.
Źródło:
Studia Ecologiae et Bioethicae; 2021, 19, 4; 27-37
1733-1218
Pojawia się w:
Studia Ecologiae et Bioethicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties the Al-7%SiMg alloy with CuAl10Fe3Mn2 used in machine building and civil engineering
Autorzy:
Lipiński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/104168.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
Al-Si alloys
aluminum bronze
mechanical properties
stopy Al-Si
brąz aluminiowy
właściwości mechaniczne
Opis:
Silumins are one of the most popular group among aluminum casting alloys. They are characterized by good mechanical and casting properties, low density, good electric and thermal conductivity, a low degree of contraction, good corrosion resistance and a relatively low melting temperature. The mechanical properties of hypoeutectic silumins can be improved through chemical modification as well as traditional or technological processing. Modification improves the mechanical properties of alloys through grain refinement. The effect of treatment has been given a lot of information first of all about microstructure and mechanical properties. This study presents the results of treatment of an Al-7%SiMg alloy with composition CuAl10Fe3Mn2 (as a powder) + (Al-7%SiMg + CuAl10Fe3Mn2) (as a powder) + (Al-7%SiMg + CuAl10Fe3Mn2) (in the form of a rod) in three different ranges. The experiments were conducted following a factor design 23 for 3 independent variables. The main addition was aluminum bronze, as well as clear or melted with raw alloy. The influence of the analyzed modifiers on the microstructure and mechanical properties of the processed alloy was presented in graphs. The modification of a hypoeutectic Al-7%SiMg alloy improved the alloy's properties. The results of the tests indicate that the mechanical properties of the modified alloy are determined by the components introduced to the alloy.
Źródło:
Quality Production Improvement - QPI; 2020, 2, 1; 247-258
2657-8603
Pojawia się w:
Quality Production Improvement - QPI
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:
Role of Si on machined surfaces of Al-based automotive alloys under varying machining parameters
Autorzy:
Razin, Ahmed Asif
Ahammed, Dewan Salsabil
Nur, Maglub Al
Kaiser, Mohammad Salim
Powiązania:
https://bibliotekanauki.pl/articles/2106430.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
Al-Si alloys
roughness
temperature
chips
microstructure
stopy Al-Si
chropowatość
temperatura
wióry
mikrostruktura
Opis:
A morphological change due to Si contend into Al-based automotive alloys has been conducted on the characterization of machined surfaces in terms of roughness, temperature, chips formation as well as microstructure evaluation under different machining conditions. For this experiment, a shaper machine with HSS single point V-shaped cutting tool is used at different cutting speeds and depths of cut. The experimental results show that the surface roughness of the alloys decreases with the cutting speed and depth of cut but it is more prominent in the case of the cutting speed. This is because of a high cutting speed, which is more associated with the higher temperature and softening the work material leading to better surface finish. Higher Si added alloys also exhibit a better surface finish because the sample content is different fine and hard intermetallic due to ageing treatment, which also makes the alloys more brittle. For brittle and higher hardness, it produces a higher temperature during machining. During machining, relatively curly and short chips are formed by the high Si added alloy because of its low elongation properties. The fracture surfaces of higher Si added alloy display more crack propagation obtained by plate-like Si rich intermetallic.
Źródło:
Journal of Mechanical and Energy Engineering; 2022, 6, 1; 43--52
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron mobility and drain current in strained-Si MOSFET
Autorzy:
Walczak, J.
Majkusiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/308631.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
electron mobility
strained-Si MOSFET
Opis:
Electron mobility and drain current in a strained-Si MOSFET have been calculated and compared with the mobility and drain current obtained for the relaxed material. In the first step, our mobility model has been calibrated to the "universal mobility" according to the available experimental data for unstrained Si MOSFETS. Then, employing the mobility parameters derived in the calibration process, electron mobility and the drain current have been calculated for strained-Si MOSFETs.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 3; 84-87
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Effect of Zr and Si on Isothermal Oxidation of Ti
Autorzy:
Ha, S.-H.
Kim, B.-H.
Yoon, Y.-O.
Lim, H.-K.
Kim, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/353260.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti
Zr
Si
silicide
oxidation
Opis:
In this study, the combined effect of Zr and Si on isothermal oxidation of Ti for 25 and 50h at 820°C, which is the temperature related to exhaust valves operation, was investigated. Si addition into Ti-5mass%Zr alloy led to a distribution of silicide Ti5Si3 phase formed by a eutectic reaction. The Ti sample containing only Zr showed more retarded oxidation rate than Ti-6Al-4V, the most prevalent Ti alloy, at the same condition. However, while a simultaneous addition of Zr and Si resulted in greater increase of oxidation resistance. The oxide layer formed after the addition of Zr and Si comprised TiO2, ZrO2, and SiO2.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1493-1495
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoplastic hardened Cu-Ni-Si-Ag alloy
Autorzy:
Krupińska, Beata
Chulist, Robert
Kondracki, Marcin
Labisz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2204523.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modification
structure
CuNi2Si1 alloy
thermo-plastic treatment
CuNi2Si1
stop CuNi2Si1
modyfikacja
obróbka termoplastyczna
struktura
Opis:
The paper aims to investigate the influence of silver addition on the microstructure of CuNi2Si1 alloys. The investigated copper alloy was cast and then supersaturated, plastically deformed on the Gleeble 3800 simulator and finally aged. Structural changes were examined using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Orientation mapping was completed with FEI Quanta 3D field emission gun scanning electron microscope (SEM) equipped with TSL electron backscattered diffraction (EBSD) system. The effect of structural and microstructural changes on hardness and conductivity was also investigated. Based on the mechanical tests it was found that the mechanical properties and conductivity are improved due to heat and plastic treatment. It was also found that the precipitation hardening raises the hardness to the level of 40% whilst an increase in conductivity by 20% is observed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e145683
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
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:
Hypoeutectic Al-Si Alloy with Cr, V and Mo to Pressure Die Casting
Autorzy:
Szymczak, T.
Gumienny, G.
Stasiak, I.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/382365.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
krystalizacja
odlewanie ciśnieniowe
stopy wieloskładnikowe
stopy Al-Si
metoda DTA
crystallization
pressure die casting
multicomponent Al-Si alloys
alloys Al-Si
DTA method
Opis:
This paper presents the results of hypoeutectic 226 grade alloy as well as prepared on its basis Al-Si alloy containing Cr, V and Mo. The additives tested were added as AlCr15, AlV10 and AlMo8 master alloys. Alloys tested were poured into DTA sampler as well as using pressure die casting. An amount of Cr, V and Mo additives in alloy poured into DTA sampler comprised within the range approximately 0.05-0.35%. Alloys to pressure die casting contained 0.05-0.20% Cr, V and Mo. The crystallization process was examined using the derivative thermal analysis (DTA). The microstructure of castings made in the DTA sampler as well as castings made with use of pressure die casting were examined. The basic mechanical properties of castings made using pressure die casting were defined too. It has been shown in the DTA curves of Al-Si alloy containing approximately 0.30 and 0.35% Cr, Mo, and V there is an additional thermal effect probably caused by a peritectic crystallization of intermetallic phases containing the aforementioned additives. These phases have a morphology similar to the walled and a relatively large size. The analogous phases also occur in pressure die casting alloys containing 0.10% or more additions of Cr, V and Mo. The appearance of these phases in pressure die casting Al-Si alloys coincides with a decrease in the value of the tensile strength Rm and the elongation A. It has been shown die castings made of Al-Si alloys containing the aforementioned additives have a higher Rm and A than 226 alloy.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 153-156
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Mechanical Properties of Al-Si Alloys by Adding an Extrusion Process to Conventional Processing Method
Autorzy:
Han, J. Y.
Femi, O. E.
Kilicaslan, F.
Jeong, C. U.
Baeg, C. H.
Hong, S. J.
Koo, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/355114.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si alloys
extrusion
mechanical properties
Opis:
In this study, the mechanical properties of Al-Si alloys was improved by selecting higher Si content and avoiding distortion in Al-Si matrix by adding an extrusion process such that the fabrication processes casting and extrusion were in sequence. Cast billets were extruded at ratios 4:1 and 10:1 to obtained two extruded bars with different processing parameters. The as-extruded samples were characterized and investigated for microstructure and mechanical properties. Optical Microscope was used to examined phase morphologies and microstructures of the extruded Al-Si bars. Mechanical properties were conducted on each sample to study the effectiveness of the additional extrusion process in high Si content Al-Si alloys. The result shows that by increasing the extrusion ratio, the size of the primary Si particle reduces leading to a higher density, better tensile and yield strength compared to the cast billet.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1179-1183
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 247

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