Effects of Ho on the microstructure and mechanical properties of Mg-Zn-Ho-Zr magnesium alloys

作     者：LI Daquan WANG Qudong DING Wenjiang LI Daquan a,b,WANG Qudong b,and DING Wenjiang b a National Engineering Research Center for Nonferrous Metals Compositions,General Research Institute for Nonferrous Metals,Beijing 100088,China b National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China

作者机构：National Engineering Research Center for Nonferrous Metals Compositions General Research Institute for Nonferrous Metals Beijing 100088 China National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200240 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2011年第30卷第2期

页      面：131-136页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (No.51074106) the International Cooperation Fund of Shanghai Science and Technology Committee:Shanghai/Rhone-Alpes Science and Technology Cooperation Fund (No. 06SR07104) the National High-Tech Research and Development Program of China (No.2009AA033501) the National High-Tech Research and Development Program of China (No.2006BAE04B01-2) 

主　　题：magnesium alloys holmium rare earth additions heat treatment microstmcture mechanical properties 

摘      要：The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail. The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho, and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries. These thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix dur- ing solution treatment, and the strengthening effect of solution-plus-ageing treatment weakened. The addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy, but the increase of high-temperature tensile strength was just a little.