中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 1 January 2012 |
（1. Materials Science and Engineering College, Chongqing University of Technology, Chongqing 400054, China;
2. Key Laboratory of Automobile Components Manufacturing and Testing Technology of Ministry of Education, Chongqing University of Technology, Chongqing 400054, China;
3. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, China）
Abstract:The as-cast microstructures and mechanical properties of Mg−3Ce−1.2Mn−0.9Sc and Mg−3Ce−1.2Mn−1Zn magnesium alloys were investigated and compared. The results indicate that the Sc-containing alloy mainly consists of α-Mg, Mg12Ce and Mn2Sc phases, and the Zn-containing alloy is mainly composed of α-Mg and Mg12Ce phases. The morphologies of the Mg12Ce phases in the two as-cast alloys are different. The Mg12Ce phases in the Sc- and Zn-containing alloys mainly exhibit particle-like shapes and continuous and/or quasti-continuous nets, respectively. Furthermore, the grains of the Sc-containing alloy are finer than those of the Zn-containing alloy. In addition, the Sc- and Zn-containing alloys have similar as-cast tensile properties at room temperature and 300 °C. However, the Sc-containing alloy exhibits higher creep-resistant properties at 300 °C and 30 MPa for 100 h than the Zn-containing alloy.
Key words: magnesium alloy; Mg−Ce−Mn based alloys; Sc; Zn; Mg12Ce phase
