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Individual and combined additions of calcium and antimony on microstructure and mechanical properties of squeeze-cast AZ91D magnesium alloy. A. K.S. Bankotia, A.K. Mondala, Subodh Kumarb, B.C. Raya aDepartment of Metallurgical and Materials Engineering, NIT-Rourkela. bDepartment of Materials Engineering, IISC- Bangalore.

T
he effects of additions of Ca and Sb on the microstructure and tensile properties of AZ91D alloy have been investigated. The additions refine the grain size and β-Mg17Al12 phase. A new Al2Ca and Mg3Sb2 phases are formed following individual additions. With combined additions, an additional Ca2Sb phase
is formed suppressing Mg3Sb2 phase. Additions of both Ca and Sb increase YS at both ambient and elevated temperatures up to 200°C. However, both ductility and UTS decrease first up to 150°C and then increase at 200°C. The increase in YS is attributed to the refinement of grain size, whereas, ductility and UTS are deteriorated by the presence of brittle Al2Ca, Mg3Sb2 and Ca2Sb phases. More in Materials Science and Engineering:A, Vol.626, 2015, Pages 186–194 (List of Research)

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