Structure Relaxation of Mg_(65)Cu_(25)Gd_(10) Metallic Glass and Its Effect on Strength

作     者：李国强 LI Guoqiang1, CAI Quan2, LI Huanxi1, ZHENG Lijing1, HE Bo3, SUN Tianyu4 (1. School of Materials Science & Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;China Perfect Machinery Industry Corp. Ltd, Shanghai 200002, China;2. Beijing Synchrotron Radiation Facility, Beijing 100039, China;3. National Synchrotron Radiation Laboratory, Hefei 230026, China;4. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033,China)

作者机构：School of Materials Science & Engineering Beijing University of Aeronautics and Astronautics China Perfect Machinery Industry Corp. Ltd 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2009年第24卷第2期

页      面：210-213页

核心收录：

学科分类：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] 0702[理学-物理学] 

基　　金：Funded by National ‘863’ Program (No. 2003AA305071) 

主　　题：Mg-based metallic glass structure relaxation strength annealing 

摘      要：To identify the re-arrangement of constituent atoms of an amorphous Mg65Cu25Gd10 alloy happened with annealing, structure relaxation of the alloy was investigated as a function of an- nealing time at 373 K through extended X-ray absorption fine structure （EXAFS） analysis procedures. To understand the effect of structure relaxation on strength, compression tests were conducted for both the as-cast and the annealed Mg65Cu25Gd10 samples. It is found that short range order around Cu and Gd atoms exhibits different variation trends with increasing annealing time at 373 K, though the structure of the alloy still remains to be amorphous. Based on the fact that the strength of the alloy first exhibits a reduction and then a recovery with annealing time, it is suggested that the enhancement of short range order around Cu should be responsible for the strength reduction, while the enhancement of short range order around Gd should be responsible for the strength recovery.