Effects of substitution of Nd in a sand-cast Mg-2.5Nd-0.6Zn-0.5Zr alloy with x wt.% Sm(x=2.5, 4, and 6)  

作　　者：Deping Zhang Qiang Yang Dongdong Zhang Kai Guan Fanqiang Bu Hong Zhou Jian Meng 

机构地区：[1]The Key Lab of Automobile Materials, The Ministry of Education, Jilin University [2]State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [3]College of Material Science and Chemical Engineering, Harbin Engineering University

出　　处：《Journal of Rare Earths》2017年第12期1261-1267,共7页稀土学报（英文版）

基　　金：Project supported by the Project 985-Automotive Engineering of Jilin University,the National Natural Science Fund of China(50635030);the Science and Development Foundation of Jilin(20060196) for financial support;supported by State Key Lab of Rare Earth Resource Utilization of Chinese Academy of Sciences with the Project of National Science & Technology Program(20130305007GX,20130305011GX,2014-GX-216A,L2015TGA9002,201001C0104669453)

摘　　要：The microstructures and mechanical properties of a series of sand-cast Mg-Sm-Zn-Zr alloys under ascast, solution-treated and peak-aged states were thoroughly investigated. The OM, XRD, SEM and HRTEM were employed to characterize the microstructural evolution. The results indicate that substitution Nd in the conventional Mg-2.5 Nd-0.6 Zn-0.5 Zr alloy with different contents of Sm has comparative grain refinement effect and will fully change the dominant intermetallic phase. In addition, the substituted alloys perform clearly higher strength with comparative ductility at both as-cast and peakaged conditions and much greater aging hardening response than the referential alloy. It is obvious that the strength increments of this alloy are attributed to the changes of the eutectic intermetallic particles on grain boundaries.The microstructures and mechanical properties of a series of sand-cast Mg-Sm-Zn-Zr alloys under ascast, solution-treated and peak-aged states were thoroughly investigated. The OM, XRD, SEM and HRTEM were employed to characterize the microstructural evolution. The results indicate that substitution Nd in the conventional Mg-2.5 Nd-0.6 Zn-0.5 Zr alloy with different contents of Sm has comparative grain refinement effect and will fully change the dominant intermetallic phase. In addition, the substituted alloys perform clearly higher strength with comparative ductility at both as-cast and peakaged conditions and much greater aging hardening response than the referential alloy. It is obvious that the strength increments of this alloy are attributed to the changes of the eutectic intermetallic particles on grain boundaries.

关 键 词：Mg-Sm-Zn-Zr Sand-cast Heat treatment Microstructure Mechanical property 

分 类 号：TG292[金属学及工艺—铸造]