中國有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 24 No. 8 August 2014 |
（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
