Influence of solidification conditions on mechanical properties of Mg-10Gd-3Y-0.5Zr magnesium alloy  

作　　者：林金保 彭立明 王渠东 周阳 丁文江 

机构地区：[1]National Engineering Research Center for Light Alloy Net Forming,Shanghai Jiao Tong University [2]School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China

出　　处：《中国有色金属学会会刊：英文版》2007年第A01期368-371,共4页Transactions of Nonferrous Metals Society of China

基　　金：Project(5133001B) supported by the National Basic Research Program (973 Program) of China

摘　　要：Mg-10Gd-3Y-0.5Zr alloy was cast in a step-like mould with five different cooling rates. The as-cast microstructures of the different steps were examined with optical microscope(OM) and scanning electron microscope(SEM). The room temperature mechanical properties were examined by tensile test. The results show that the microstructures are refined and the second phase particles are distributed much uniformly with the increase of cooling rate. The increase of yield strength,ultimate strength and elongation can be ascribed mainly to the strengthening effect of fine grains. The relationship between grain size and yield strength/hardness agrees with the Hall-Petch behavior.Mg-10Gd-3Y-0.5Zr alloy was cast in a step-like mould with five different cooling rates. The as-cast microstructures of the different steps were examined with optical microscope（OM） and scanning electron microscope（SEM）. The room temperature mechanical properties were examined by tensile test. The results show that the microstructures are refined and the second phase particles are distributed much uniformly with the increase of cooling rate. The increase of yield strength, ultimate strength and elongation can be ascribed mainly to the strengthening effect of fine grains. The relationship between grain size and yield strength/hardness agrees with the Hall-Petch behavior.

关 键 词：镁 合金 凝固条件 机械性能 微观结构 

分 类 号：TG292[金属学及工艺—铸造]