Comparison of effects of cerium, yttrium and gadolinium additions on as-cast microstructure and mechanical properties of Mg-3Sn-1Mn magnesium alloy

杨明波^1,2,3，秦财源¹，潘复生³，周涛¹

1. Materials Science and Engineering College, Chongqing University of Technology2. Key Laboratory of Automobile Components Manufacturing and Testing Technology of the Education Ministry, Chongqing University of Technology3. National Engineering Research Center for Magnesium Alloys, Chongqing University

摘 要：The effects of Ce, Y and Gd additions on the as-cast microstructure and mechanical properties of Mg-3Sn-1Mn alloy were investigated and compared by using optical and electron microscopies, X-ray diffraction analysis, and tensile and creep tests. The results indicated that the microstructure of the Mg-3Sn-1Mn alloy with the addition of 0.87 wt.%Ce was refined while the microstructures of the alloys with the additions of 0.79 wt.%Y or 0.84 wt.%Gd were coarsened. Furthermore, adding 0.87 wt.%Ce to the Mg-3Sn-1Mn alloy could improve the tensile properties while adding 0.79 wt.%Y or 0.84 wt.%Gd gave a detrimental effects on the tensile properties. In addition, adding 0.87 wt.%Ce, 0.79 wt.%Y and 0.84 wt.%Gd to the Mg-3Sn-1Mn alloy could improve the creep properties. Among the three additions, the addition of 0.87 wt.%Ce was more suitable to further improve the strength and creep performance of the Mg-3Sn-1Mn alloy.

关键词：