Abstract
The solidification behavior and as-cast microstructure in AZ80-Bi magnesium alloy were analysed by OM,SEM,XRD and DSC.Meanwhile,the evolution of the solidification microstructure of AZ80-2%Bi alloy was studied by heating-quenching experiments.The results show that the as-cast microstructure of AZ80-2%Bi consists of primaryα-Mg matrix,divorced eutecticβ-Mg_(17)Al_(12) phase and Mg_3Bi_2 phase.The Mg_3Bi_2 phase exists in the flake-like and granule-like morphologies. With 2.0%Bi addition,the solidification procedure of AZ80 magnesium alloy is changed.The ternary eutectic transformation L→α-Mg+β-Mg_(17)Al_(12)+Mg_3Bi_2(at 435℃) takes place during solidification of AZ80-2%Bi alloy instead of the binary eutectic transformation L→α-Mg+β-Mg_(17)Al_(12)(at 437℃) in AZ80 alloy.Comparing with AZ80 alloy,the nucleating temperature of primaryα-Mg in AZ80- 2%Bi alloy is decreased from 568.8℃to 562.6℃,and the eutectic temperature is also decreased from 424.2℃to 421.1℃.
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