2005•Journal of the Korea Foundry SocietyRequires access

The Effects of Mn and Cr Additions on the Microstructure of A356 Alloys Containing Impure Fe

Sang-Won Han

Abstract

The effects of Mn and Cr on the crystallization behaviors of Fe-bearing intennetallics in A356 alloy were studied. Coarse and acicular FeSi phase in A356-0.20wt.%Fe alloy was modified into small -Al(Fe,Mn)Si and -Al(Fe,Cr)Si phases in response to Mn and Cr addition, respectively. Increasing of Mn addition amount elevates the crystallizing temperature of -Al(Fe,Mn)Si and the Mn/Fe ratio in the -Al(Fe,Mn)Si. Cr is more effective to modify FeSi in comparison with Mn. -Al(Fe,Mn)Si phase had BCC/SC dual structure.

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Key concepts: Acicular, Materials science, Alloy, Microstructure, Phase (matter), Metallurgy, Crystallization, Manganese