Chinese Script vs Plate-Like Precipitation of Beta-Al^sub 9^Fe^sub 2^Si^sub 2^ Phase in an Al-6.5Si-1Fe Alloy

The microstructure of a high-purity Al-6.5Si-1Fe (wt pct) alloy after solidification at various cooling rates was investigated. In most of the cases, the monoclinic beta-Al^sub 9^Fe^sub 2^Si^sub 2^ phase was observed as long and thin lamellae. However, at a very slow cooling rate, Fe-bearing precipi...

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Bibliographic Details
Published inMetallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 46; no. 7; p. 2814
Main Authors Ferdian, Deni, Josse, Claudie, Nguyen, Patrick, Gey, Nathalie, Ratel-ramond, Nicolas, de Parseval, Philippe, Thebault, Yannick, Malard, Benoit, Lacaze, Jacques, Salvo, Luc
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.07.2015
Subjects
Aluminum alloys
Microstructure
Temperature
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Summary:The microstructure of a high-purity Al-6.5Si-1Fe (wt pct) alloy after solidification at various cooling rates was investigated. In most of the cases, the monoclinic beta-Al^sub 9^Fe^sub 2^Si^sub 2^ phase was observed as long and thin lamellae. However, at a very slow cooling rate, Fe-bearing precipitates with Chinese script morphology appeared together with lamellae. Further analysis showed all these Chinese script precipitates correspond also to the monoclinic beta phase. This finding stresses that differentiating second phases according to their shape may be misleading.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-015-2917-1