Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 8    August 2014

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Effects of Ce, Y and Gd additions on as-cast microstructure and mechanical properties of Mg-3Sn-2Sr magnesium alloy
Ming-bo YANG1,2,3, Meng-dan HOU2, Jia ZHANG2, Fu-sheng PAN3

1. Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Ministry of Education,
Chongqing University of Technology, Chongqing 400054, China;
2. Materials Science and Engineering College, Chongqing University of Technology, Chongqing 400054, China;
3. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China

Abstract:The effects of Ce, Y and Gd additions on the as-cast microstructure and mechanical properties of Mg-3Sn-2Sr alloy were investigated and compared by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry analysis, tensile and creep tests. The results indicate that the Mg-3Sn-2Sr ternary alloy is mainly composed of a-Mg, primary and eutectic SrMgSn, and Mg2Sn phases. After the additions of 1.0% Ce, 1.0% Y and 1.0% Gd to the Mg-3Sn-2Sr alloy, the Mg12Ce, YMgSn, GdMgSn and/or Mg17Sr2 phases are formed, respectively. At the same time, the formation of the primary SrMgSn phase is suppressed and the coarse needle-like primary SrMgSn phase is modified and refined. In addition, the additions of 1.0% Ce, 1.0% Y and 1.0% Gd to the Mg-3Sn-2Sr alloy can simultaneously improve the tensile and creep properties of the alloy. Among the Ce-, Y- and Gd-containing alloys, the tensile properties of the Ce-containing alloy are relatively higher than those of the Y- and Gd-containing alloys.

 

Key words: Mg-Sn-Sr alloys; Ce; Y; Gd; SrMgSn phase

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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