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Effects of Mn, Cr, and Sr Additions on the Microstructure and Tensile Properties of Al-7Si-0.4Mg-1Fe Casting Alloy  

Kim, Jeong-Min (Division of Advanced Materials Engineering, Hanbat National University)
Park, Joon-Sik (Division of Advanced Materials Engineering, Hanbat National University)
Kim, Ha-Young (Division of Advanced Materials Engineering, Hanbat National University)
Cho, Jae-Ik (Kwangju R&D Center, Korea Institute of Industrial Technology)
Jung, Chang-Yeol (Kwangju R&D Center, Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.29, no.1, 2009 , pp. 27-32 More about this Journal
Abstract
The microstructure of Al-7Si-0.4Mg-1Fe alloy mainly consists of aluminum dendrites, Al-Si eutectics, and $Al_5FeSi$ needles. When Mn was added to the alloy, the substantial amount of $Al_5FeSi$ phase was changed into Al(Mn,Fe)Si, however the needle-like morphology was almost unchanged. Combined additions of Cr or Sr with Mn to the base alloy resulted in rod-like Al(Mn, Fe,Si)Si phase. The tensile properties of as-cast alloys were enhanced by the Mn addition, especially when it was added with Sr. The tensile properties after T6 heat treatment was a little improved with 0.7%Mn addition, but Cr or Sr additions with Mn didn't show any positive effect on the properties of heat-treated alloys.
Keywords
Casting; Aluminum alloy; Tensile Properties; Iron content;
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