Microstructures, Mechanical and Creep Properties of Rapidly Solidification/Powder Metallurgy Mg-6wt.%Zn Alloys with 5wt.%Ce and 1.5wt.%Ca Additions
Rapidly solidification/powder metallurgy (RS/PM) Mg-6Zn, Mg-6Zn-5Ce and Mg-6Zn-5Ce-l.5Ca (wt.%) alloys were produced via hot extrusion with RS powders, produced by atomization-twin roll quenching.Microstructures, mechanical and creep properties of the alloys were investigated.The results showed that for the Mg-6Zn alloys with 5wt.%Ce and 1.5wt.%Ca additions,the microstructures of the alloys were gradually refined, which caused the strength of the alloy at room temperature to increase remarkably, especially for the RS/PM Mg-6Zn-5Ce-1.5Ca alloy,exhibited a high compressive strength of 394MPa at room temperature.At elevated temperatures, due to the fine and stable intermetallic compounds i.e.MgxZnyCez and MgxZnyCez-(Ca) phases were formed for the Mg-6Zn-5Ce alloy and Mg-6Zn-5Ce-l.5Ca alloys, respectively, and the thermal stability of the ternary phase was a little lower than that of the quaternary phase because of the dissolving of Ca into the MgxZnyCez phase, the mechanical and creep properties at elevated temperatures increased remarkably with Ce and Ca additions, especially for the RS/PM Mg-6Zn-5Ce-1.5Ca alloy, which exhibited a high compressive strength of 258MPa at 200℃, and the minimum creep rate was decreased about 2 times, compared with that of the Mg-6Zn-5Ce alloy.
Rapidly solidification/powder metallurgy Mg-Zn alloys with Ce and Ca additions Microstructure Mechanical property Creep property
Tao Zhou Denghui Song Zhenhua Chen
College of Material Science and Engineering, Chongqing University of Technology, Chongqing,400054, C College of Material Science and Engineering, Hunan University, Changsha, 410082, China
国际会议
The 12th Asia-Pacific Conference on Materials Processing(APCMP2016)(第12届亚太材料加工会议)
青岛
英文
253-263
2016-06-16（万方平台首次上网日期，不代表论文的发表时间）