Temat: Al-Cu alloy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wpływ miedzi na strukturę pierwotną i przemianę eutektyczną w stopach Al-Cu
Influence of Copper on the Primary Structure and Eutectic Transformation in Al-Cu Alloys
Autorzy:: Sikora, G.
Powiązania:: https://bibliotekanauki.pl/articles/381249.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metalografia
stop Al-Cu
krzywa stygnięcia
dendryt
ziarno równoosiowe
metalography
Al-Cu alloy
cooling curve
dendrite
equiaxed grain
Opis:: W ramach niniejszej pracy zbadano wpływ miedzi (1-5 % mas.) na strukturę pierwotną i przemianę eutektyczną w stanie wyjściowym jak i modyfikowanym. W tym celu wykonano dwie serie wytopów: wyjściową oraz modyfikowaną, gdzie, jako modyfikatora użyto zaprawy AlTi5B1 w ilości 0,2 % mas. W przypadku serii stopów niemodyfikowanych w całym badanym zakresie zawartości miedzi obserwuje się krystalizację egzogeniczną, z dobrze rozwiniętymi gałęziami dendrytów (ziaren pierwotnych). Badania metalograficzne wykazały zmniejszenie szerokości ziaren kolumnowych ze wzrostem zawartości miedzi. W przypadku serii modyfikowanej obserwuje się transformację z ziaren kolumnowych na równoosiowe podczas krystalizacji (egzogeniczna-endogeniczna). W tym przypadku dendryty (ziarna) nie posiadają dobrze rozwiniętych gałęzi. Wykazano wpływ miedzi na zwiększenie liczby ziaren pierwotnych i zmniejszenie ich średniej średnicy wraz ze wzrostem zawartości miedzi w badanych stopach. [...]
This paper investigated influence of copper content on the primary structure and eutectic transformation in Al-Cu alloys in base and modified states. In this aim two series of alloys was performed: first based and second modified with AlTi5B1 master alloy in amount of 0,2% mass percent. In case of first alloys series it was observed the exogenous crystallization with well expanded second dendrite arm spacing SDAS. The metallographic examinations was shown decrease width of columnar grains with amount of copper. In modified series was observed a transformation from columnar to equiaxed grains during solidification (exogenous-endogenous) process. In this case grains does not have well expanded second arm spacing as well as first series. It has been shown influence of copper on increase grains density and decrease their average diameter. [...]
Źródło:: Archives of Foundry Engineering; 2015, 15, 4 spec.; 113-118
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy
Autorzy:: Górny, M.
Sikora, G.
Kawalec, M.
Powiązania:: https://bibliotekanauki.pl/articles/381182.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: quality management
Al-Cu alloy
fading effect
primary grains of α(Al)
zarządzanie jakością
metalografia
stop Al-Cu
zanik
ziarna pierwotne
Opis:: The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα-Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control.
Źródło:: Archives of Foundry Engineering; 2016, 16, 3; 35-38
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: The Microstructure of AlSi9Cu3 Alloy after Different Stages of Liquid Metal Preparation
Autorzy:: Poloczek, Ł.
Dybowski, B.
Łuszczak, M.
Kiełbus, A.
Powiązania:: https://bibliotekanauki.pl/articles/380869.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metallography
alloy Al-Si-Cu
microstructure
scrap
liquid metal treatment
metalografia
stop Al-Si-Cu
złom
obróbka metalu ciekłego
Opis:: Aluminium alloys are one of the most important casting alloys. Among them, the Al-Si alloys comprise perhaps the most important group – about 80% of the aluminium casts are made of them. These materials are characterized by a very good technological properties, good corrosion resistance and tribological properties. Their main disadvantage is, however, presence of the massive, brittle silicon crystals. They significantly affect alloys mechanical properties. Liquid metal treatment is essential for modification of Al-Si eutectic structure. The following work presents results of the research on the microstructure of the AlSi9Cu3 alloy after different stages of liquid metal preparation. Three casting processes have been conducted, chemical composition of the material in each case was in agreement with EN 1706 specification. During each casting process, three specimens were gravity cast: first, made from pure ingots; second, after the scrap addition and third one after the liquid metal treatment. Qualitative and quantitative evaluation of the microstructure was done on each specimen. Specimens cast from pure ingots are characterized by a refined Al-Si eutectic microstructure. After scrap addition, the silicon crystals became morphology of the massive platelets. What is more, intermetallic phases observed within the structure posses different morphologies after different stages of liquid metal preparation. After scrap addition, increased gas porosity was observed. Liquid metal treatment reduced slightly the formation of gas pores.
Źródło:: Archives of Foundry Engineering; 2015, 15, 1 spec.; 89-92
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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