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Structure Relaxation of Mg65Cu25Gd10 Metallic Glass and Its Effect on Strength

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【作者】 李国强；

【Author】 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)

【机构】 School of Materials Science & Engineering, Beijing University of Aeronautics and Astronautics； China Perfect Machinery Industry Corp. Ltd；

【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 annealing 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.

【Abstract】 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 annealing 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.

【关键词】 Mg-based metallic glass； structure relaxation； strength； annealing；
【Key words】 Mg-based metallic glass； structure relaxation； strength； annealing；
【基金】 Funded by National ‘863’ Program (No. 2003AA305071)
  • 【文献出处】 Journal of Wuhan University of Technology(Materials Science Edition) ,武汉理工大学学报(材料科学版)(英文版) , 编辑部邮箱 ,2009年02期
  • 【分类号】TG139.8
  • 【被引频次】1
  • 【下载频次】32
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