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Wyświetlanie 1-10 z 182
Tytuł:
Granulation of Cu-Al-Fe-Ni Bronze
Autorzy:
Pisarek, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/381371.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative materials
aluminium bronze
granulation
sieve analysis
microstructure
microhardness
innowacyjne technologie odlewnicze
materiały innowacyjne
analiza sitowa
mikrostruktury
mikrotwardość
Opis:
With the increase in wall thickness of the casting of iron-nickel-aluminium-bronze, by the reduction of the cooling rate the size of &κII phase precipitates increases. This process, in the case of complex aluminium bronzes with additions of Cr, Mo and W is increased. Crystallization of big κII phase, during slow cooling of the casting, reduces the concentration of additives introduced to the bronze matrix and hardness. Undertaken research to develop technology of thick-walled products (g> 6 mm) of complex aluminium bronzes. Particular attention was paid to the metallurgy of granules. As a result, a large cooling speed of the alloy, and also high-speed solidification casting a light weight of the granules allows: to avoid micro-and macrosegregation, decreasing the particle size, increase the dispersion of phases in multiphase alloys. Depending on the size granules as possible is to provide finished products with a wall thickness greater than 6 mm by infiltration of liquid alloy of granules (composites). Preliminary studies was conducted using drip method granulate of CuAl10Fe5Ni5 bronze melted in a INDUTHERM-VC 500 D Vacuum Pressure Casting Machine. This bronze is a starting alloy for the preparation of the complex aluminium bronzes with additions of Cr, Mo, W and C or Si. Optimizations of granulation process was carried out. As the process control parameters taken a casting temperature t (°C) and the path h (mm) of free-fall of the metal droplets in the surrounding atmosphere before it is intensively cooled in a container of water. The granulate was subjected to a sieve analysis. For the objective function was assume maximize of the product of Um*n, the percentage weight "Um" and the quantity of granules 'n' in the mesh fraction...
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 61-66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of Al-Fe sinters made by the powder metallurgy route
Charakterystyka spieków Al-Fe wytworzonych metodą metalurgii proszków
Autorzy:
Majchrowska, M.
Lasek, K.
Nowak, M.
Pałka, P.
Sułkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/264175.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Al/Fe sinters
powder metallurgy
interface
intermetallic compounds
microstructure
spieki Al/Fe
metalurgia proszków
interfejs
związki międzymetaliczne
mikrostruktura
Opis:
The Al/Fe material was prepared by the powder metallurgy route with an additional intermediate stage which was a centrifuge of powder mixture. The application of the centrifuge stage was applied to obtain circular phase distribution of Al-rich phases in a sintered material. Iron powder with a particle size under 100 μm and aluminum powder with a particle size of about 25 μm, were used as starting materials. To determine the effect of centrifuging time on the distribution of Fe-Al particles, scanning electron microscopy (SEM, EDS) and XRD techniques were used. Microstructure observations show the influence of the centrifuging time on the distribution of Fe particles. It was observed that a longer centrifuging time caused changes in the ratio concentration of elements and allowed the growth of the intermetallic phase at the interface between solid Al and Fe particles.
Spiekane materiały Al/Fe wytwarzano metodą metalurgii proszków z wprowadzeniem etapu pośredniego w postaci odwirowania mieszaniny proszku. Etap wirowania miał na celu uzyskanie kulistego rozkładu faz bogatych w Al w spiekanym materiale. Proszek żelaza o wielkości cząstek poniżej 100 μm i proszek aluminium o wielkości cząstek około 25 μm zastosowano jako materiały wyjściowe. W celu określenia wpływu czasu wirowania mieszanki na rozkład faz w wytworzonym materiale zastosowano techniki skaningowej mikroskopii elektronowej (SEM, EDS) i dyfraktometrii rentgenowskiej (XRD). Obserwacje mikrostruktury wykazały istotny wpływ czasu wirowania na mikrostrukturę uzyskanych spieków. Zaobserwowano, że dłuższy czas wirowania spowodował zmianę stosunku stężenia pierwiastków i pozwolił na wzrost fazy międzymetalicznej na granicy faz między stałymi cząstkami Al i Fe. Badania mikrotwardości obszarów spiekanego materiału świadczą o zwiększeniu twardości w obszarach nowo utworzonych faz międzymetalicznych.
Źródło:
Metallurgy and Foundry Engineering; 2018, 44, 4; 195-203
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of Cu-Al-Fe-Ni bronze crystallization
Autorzy:
Pisarek, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/383278.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theoretical basis
foundry proces
thermal analysis
derivative analysis
microstructure
Cu-Al-Fe-Ni bronze
model of crystallization
podstawy teoretyczne
proces odlewniczy
analiza termiczna
analiza derywacyjna
mikrostruktura
brąz Cu-Al-Fe-Ni
model krystalizacji
Opis:
According to the analysis of the current state of the knowledge shows that there is little information on the process of phase transformations that occur during the cooling Cu-Al-Fe-Ni hypo-eutectoid bronzes with additions of Cr, Mo and/or W, made additions individually or together, for the determination of: the type of crystallizing phases, crystallizing phases, order and place of their nucleation. On the basis of recorded using thermal and derivative analysis of thermal effects phases crystallization or their systems, analysis of the microstructure formed during crystallization - observed on the metallographic specimen casting ATD10-PŁ probe, analysis of the existing phase equilibrium diagrams forming elements tested Cu-Al-Fe-Ni bronze, with additions of Cr, Mo, W and/or Si developed an original model of crystallization and phase transformation in the solid state, the casting of high quality Cu-Al-Fe-Ni bronze comprising: crystallizing type phase, crystallizing phase sequence, place of nucleation.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 72-79
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Application οf Al,Fe-Pillared Clays
Autorzy:
Banković, P.
Milutinović-Nikolić, A.
Jović-Jovičić, N.
Dostanić, J.
Čupić, Ž.
Lončarević, D.
Jovanović, D.
Powiązania:
https://bibliotekanauki.pl/articles/1808061.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.43.Gt
61.46.-w
68.43.-h
82.65.+r
Opis:
Al,Fe-pillared clay was synthesized from domestic clay from Bogovina according to a common procedure: grinding, sieving, Na exchange, pillaring, drying and calcination. Two synthesized samples differing only in calcining conditions were prepared. Phase composition and textural properties of the starting clay and synthesized pillared clays were characterized using X-ray diffraction and physisorption of nitrogen. Catalytic tests were performed using sample with better textural properties being the one submitted to milder calcining conditions. Catalytic wet peroxide oxidative degradation of aromatic compounds phenol and tartrazine on the synthesized catalyst was confirmed showing better efficiency in the case of tartrazine.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of an Al-Fe-Ni Decagonal Quasicrystal Studied by Cs-Corrected STEM
Autorzy:
Yasuhara, A.
Yamamoto, K.
Yubuta, K.
Hiraga, K.
Powiązania:
https://bibliotekanauki.pl/articles/1373700.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.-f
Opis:
The structure of an Al-Fe-Ni decagonal quasicrystal with two quasiperiodic planes along the periodic axis in an $Al_{72}Ni_{24}Fe_4$ alloy has been examined by spherical aberration (Cs)-corrected scanning transmission electron microscopy with high-angle annular dark-field and annular bright-field techniques. The transition-metal atoms and mixed sites (MSs) of Al and transition-metal atoms are represented as separated bright dots in the observed high-angle annular dark-field scanning transmission electron microscopy images, and consequently the arrangements of transition-metal atoms and mixed sites on the two quasiperiodic planes can be directly determined. The transition-metal atoms are arranged on a pentagonal tiling of an edge-length of 0.76 nm. The close examination of observed annular bright-field- and high-angle annular dark-field scanning transmission electron microscopy images indicates the existence of large decagonal columnar clusters with 3.2 nm diameter, and their arrangement on pentagonal, thin rhombic and squashed hexagonal tiles with an edge-length of 3.2 nm. The arrangements of transition-metal atoms in these three tiles are placed on an ideal pentagonal tiling with an edge-length of 3.2 nm, which is generated by the projection of a five-dimensional hyper-cubic lattice. The vertices are denoted by 5D hyper-cubic indices and then they are projected on the occupation domains in perpendicular space. The arrangement of Al atoms as well as transition-metal atoms and mixed sites in the large decagonal atom cluster with about 3.2 nm diameter is interpreted from the observed high-angle annular dark-field- and annular bright-field scanning transmission electron microscopy ABF-STEM images.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 637-640
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of heat treatment on point defect concentration in Fe-Al and Fe-Al-Cr systems
Autorzy:
Kansy, J.
Hanc, A.
Giebel, D.
Powiązania:
https://bibliotekanauki.pl/articles/146336.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron annihilation
Fe-Al
Fe-Al-Cr
point defects
Opis:
FeAl alloys of nominal Al content 28, 38 and 45 at.% and Fe28Al5Cr with minor alloying elements added to improve their application properties are studied by positron annihilation lifetime analysis. The lifetime spectra of samples FeXAl with X greater-than or equal to 38 (both quenched and cooled with furnace) are described by a single lifetime component related to the saturated positron trapping by quenched-in vacancies of concentration much higher than 100 ppm. A very strong dependence of retained vacancy concentration on the rate of cooling is shown for Fe28Al and Fe28Al5Cr alloys. After quenching, the concentration is of the order of 10.4 whereas in samples slowly cooled it is reduced to 10.5. The chromium addition to Fe28Al5Cr dismisses the vacancies concentration in comparison to the concentration in Fe28Al after the same heat treatment.
Źródło:
Nukleonika; 2010, 55, 1; 21-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Characterization and Properties of Al/Fe Multi-Layer Composites Produced by Hot Pressing
Autorzy:
Kowalski, Wojciech
Paul, Henryk
Mania, Izabela
Petrzak, Paweł
Czaja, Paweł
Chulist, Robert
Góral, Anna
Szlezynger, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2203732.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Fe/Al multilayered composite
intermetallic phase
electron microscopy
microhardness test
Opis:
This study aimed to develop Fe/Al multilayered metallic/intermetallic composites produced by hot pressing under an air atmosphere. Analyses were carried out on the composite plates made up of alternatively situated sheets of AA1050 aluminum alloy and DN04 low carbon steel, which were annealed at 903 K for 2, 5, and 10 h. Annealing was performed to obtain reaction layers of distinct thickness. The samples were examined using X-Ray diffraction and scanning and transmission electron microscope equipped with an energy-dispersive X-Ray spectrometer. To correlate the structural changes with mechanical properties, microhardness measurements in near-the-interface layers were performed. All the reaction layers grew with parabolic kinetics with η-Al5Fe2 intermetallic phase as the dominant component. After annealing for 5 and 10 hours, a thin sublayer of θ-Al13Fe4 phase was also detected.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 137--144
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania plastometryczne i mikrostrukturalne stopów Fe-28Al-Cr i Fe-38Al
Plastometric and microstructure tests of alloys Fe-28Al-Cr and Fe-38Al
Autorzy:
Bednarczyk, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/211594.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
stopy z układu Fe-Al
mikrostruktura
próba osiowosymetrycznego ściskania
procesy odbudowy struktury
Fe-Al intermetallic phase-based alloys
microstructure
axial-symmetric compression test
structure recovery processes
Opis:
Stopy na bazie uporządkowanych faz międzymetalicznych, tzw. intermetaliki, należą do grupy materiałów metalicznych o właściwościach pośrednich pomiędzy metalami a ceramiką. Szczególne zainteresowanie ze względu na korzystne właściwości znalazły stopy na osnowie faz międzymetalicznych Fe3Al i FeAl z układu Fe-Al. W artykule przedstawiono wpływ parametrów odkształcenia plastycznego na zmiany mikrostruktury stopów z układu Fe-Al. Odkształcenie realizowano w próbie osiowosymetrycznego ściskania na symulatorze Gleeble 3800, przy temperaturze w zakresie od 600 do 1200oC, z prędkością odkształcenia 0,1, 1,0 i 10,0 s-1. Na podstawie zależności naprężenia uplastyczniającego od odkształcenia wyznaczono maksymalne wartości naprężenia uplastyczniającego oraz odkształcenia odpowiadającemu temu naprężeniu w zależności od temperatury i prędkości odkształcenia. W celu obliczenia wartości parametru Zenera-Hollomona Z, czyli skorygowanej ze względu na temperaturę prędkości odkształcenia obliczono energię aktywacji Q procesu odkształcenia plastycznego. Przeprowadzono analizę mikrostruktury z użyciem mikroskopii świetlnej i elektronowej stopów Fe-28Al-5Cr i Fe-38Al w stanie odlewanym i po wyżarzaniu ujednorodniającym oraz po osiowosymetrycznym ściskaniu. Z analizy mikrostruktury wynika, że występują odmienne procesy odbudowy struktury dla stopów Fe-28Al-5Cr oraz Fe- 38Al. Dla stopu Fe-28Al-5Cr dominującym procesem odbudowy struktury jest zdrowienie dynamiczne, a dla stopu o wyższej zawartości aluminium Fe-38Al dominuje rekrystalizacja dynamiczna. Otrzymane wyniki badań plastyczności, analizy ilościowej i jakościowej substruktury oraz opis zjawisk zachodzących w trakcie odkształcenia na gorąco istotnie wpłyną na uzupełnienie dotychczasowej wiedzy o stopach na osnowie faz międzymetalicznych z układu Fe-Al.
Alloys based on systematic intermetallic phases belong to a group of metallic materials which share the characteristics of metals and ceramics. On account of the highly advantageous properties, the Fe-Al intermetallic phase-based alloys, i.e. Fe3Al and FeAl, are considered particularly interesting. This article provides a discussion on the effect of plastic strain parameters on changes to the microstructure of the Fe-Al system alloys. The plastic strain was achieved in a test of axial-symmetric compression using the Gleeble 3800 simulator at temperatures ranging from 600oC to 1200oC with the strain rate of 0.1; 1.0 and 10.0 s-1. Based on the dependences between flow stress and strain thus established, it was possible to determine the maximum flow stress as well as the value of strain corresponding to this stress for different temperatures and strain rates. In order to calculate the Zener-Hollomon parameter Z which is deformation speed corrected due to temperature there was activation energy Q of the plastic deformation process calculated. The microstructure of the Fe-28Al-5Cr and the Fe-38Al alloy was analysed after casting and homogenising, and following the test of axial-symmetric compression using light and electron microscopy techniques. With reference to results of the microstructure analysis, it was evidenced that the Fe-28Al-5Cr and the Fe-38Al alloy displayed disparate processes of structure recovery. The predominant structure recovery process for the Fe-28Al- 5Cr alloy is known as dynamic recovery, while for the Fe-38Al alloy with a higher aluminium content, dynamic recrystallisation was proved to be dominant. The results produced by the plasticity tests, an analysis of the substructure as well as a description of the phenomena that took place during hot strain will exert significant influence on expanding the current state of knowledge about the Fe-Al intermetallic phase-based alloys.
Źródło:
Obróbka Plastyczna Metali; 2019, 30, 2; 121-134
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray diffraction studies of rapid cooled Al-V and Al-Fe-V alloys
Autorzy:
Shved, O.
Mudry, S.
Girzhon, V.
Smolyakov, O.
Powiązania:
https://bibliotekanauki.pl/articles/368687.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Al-based alloys
quasicrystals
rapid cooling
microhardness
stopy na bazie Al
kwazikryształy
przyspieszone chłodzenie
mikrotwardość
Opis:
Purpose: of this paper is to deep and more complete knowledge about the features of phase and structure formation in Al-based alloys with transition metals (TM) Fe and V at rapid cooling from melt. It is known, that nonequilibrium synthesis conditions of such alloys lead to quasicrystalline, amorphous or metastable phases formation, which can significantly improve the physical-chemical properties and first of all the mechanical ones. But understanding of compositional dependences of structure features at formation under nonequilibrium conditions and the correlation of these dependences with physical properties of alloys is far to be clear. Design/methodology/approach: Structure of Al-enriched Al-V, Al-V-Fe rapid cooled alloys was studied by X-ray diffraction method. In order to estimate the influence of structural state of alloy on the mechanical properties the integral microhardness was studied by Vickers method. Findings: Two quasicrystalline icosaedral phases with different cell parameters are revealed in ternary alloys Al100-3xV2xFex (x=2-4). Increasing of transition metal content promotes the formation of phase with higher quasicell parameter embedded in amorphous matrix. With increasing of the transition elements total content from 6 up to 12 at. % the microhardness of alloys increased gradually from 867 to 3050 MPa. Research limitations/implications: Research of nonequilibrium alloys revealed crystalline structure of Al-V alloys and quasicrystalline embedded in amorphous matrix of Al-Fe-V ternary alloys. Obtained results suppose that further structure and physical properties studies of Al-Fe-V alloys will allows to find the conditions to control the producing of materials with desired properties. Practical implications: Using of rapid cooling method for synthesis of Al-enriched Al-Fe-V alloys give an opportunity to produce alloys with significantly improved mechanical properties. Originality/value: Nonequilibrium conditions of cooling allow significantly changes the structure and properties.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 1; 5-11
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joining of Low-Carbon Steel Sheets with Al-Based Weld
Autorzy:
Boczkal, G.
Perek-Nowak, M.
Majewska, Z.
Powiązania:
https://bibliotekanauki.pl/articles/353774.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resistance welding
Al/Fe interface
shear test
Opis:
The analysis of the connection steel/Al/steel made by resistance welding was performed. The used low-carbon steel had low content of carbon and other elements, aluminum was of 99.997 wt.% Al purity. Formation of various FeAl intermetallic phases found in the phase diagram depending on the duration of the process was analyzed. Two distinctively different types of structure depending on time of welding were observed: 1) hypoeutectic structure for samples processed for 5 s, and 2) eutectic structure for samples processed for 10 s and more. The shear test showed increase of mechanical properties of the connection for the samples welded 10 s.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 37-42
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 182

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