Influence of sub-rapid solidification on microstructure and mechanical properties of AZ61A magnesium alloy

来源期刊：中国有色金属学报(英文版)2008年增刊第1期

论文作者：滕海涛 李廷举 张小立 张忠涛

文章页码：86 - 90

Key words：sub-rapid solidification; grain size; mechanical property; fracture surface morphology

Abstract: The microstructure of sub-rapid solidification processed AZ61A magnesium alloy was presented and discussed. The results show that the grain size of the foil is significantly refined, and the grain morphology is cellular or globular. The eutectic transformation L→α-Mg+β-Mg₁₇Al₁₂ and microsegregation in conventionally solidified AZ61A alloy are suppressed to a great extent. The β-Mg₁₇Al₁₂ phases located in the α-Mg grain boundaries are largely decreased due to high solidification cooling rate. As a consequence, the alloying elements Al, Zn, Mn show much higher solid solubility and the sub-rapid solidification microstructure dominantly consists of supersaturated α-Mg solid solution. The mechanical properties and fractographic analysis reveal that the fracture mechanism and corresponding morphology of the rapture surface of tensile bars are linked to the microstructure obtained and depend on the sub-solidification processes.

基金信息：the National Natural Science Foundation of China