Chinese Script vs Plate-Like Precipitation of Beta-Al9Fe2Si2 Phase in an Al-6.5Si-1Fe Alloy
Metallurgical and Materials Transactions A, 2015•Springer
The microstructure of a high-purity Al-6.5 Si-1Fe (wt pct) alloy after solidification at various
cooling rates was investigated. In most of the cases, the monoclinic beta-Al 9 Fe 2 Si 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 …
cooling rates was investigated. In most of the cases, the monoclinic beta-Al 9 Fe 2 Si 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 …
Abstract
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-Al9Fe2Si2 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.
Springer
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