| Mg_(65)Cu_(25)Y_xGd_(10-x)(x=0,5,10)玻璃形成能力的EXAFS分析 |
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| 引用本文： | 李国强,蔡泉,郑立静,李焕喜. Mg_(65)Cu_(25)Y_xGd_(10-x)(x=0,5,10)玻璃形成能力的EXAFS分析[J]. 稀有金属材料与工程, 2008, 37(12) |
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| 作者姓名： | 李国强 蔡泉 郑立静 李焕喜 |
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| 作者单位： | 1. 北京航空航天大学,北京,100083
2. 北京同步辐射实验室,北京,100039 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 采用扩展X射线精细结构谱（EXAFS）分析了Mg65Cu25YxGd10-x（x=0,5,10）非晶合金局域原子结构及合金的玻璃形成能力差异的原因。结果表明，随着替代元素Gd含量的增加，淬态Mg65Cu25YxGd10-x非晶合金吸收原子Cu周围的配位数单调增加，而最近邻原子间距呈现出微弱的下降，短程有序进一步增强。Mg65Cu25YxGd10-x系非晶合金中Cu原子周围形成配位数越大、原子间束缚更加紧密的多面体构型的短程有序结构，越有利于合金玻璃形成能力的提高。
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| 关 键 词： | 镁合金 非晶合金 短程有序 EXAFS 玻璃形成能力 |
EXAFS Studies on Glass-Forming Ability of Amorphous Mg_(65)Cu_(25)Y_xGd_(10-x)(x=0,5,10) Alloys |
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| Li Guoqiang,Cai Quan,Zheng Lijing,Li Huanxi. EXAFS Studies on Glass-Forming Ability of Amorphous Mg_(65)Cu_(25)Y_xGd_(10-x)(x=0,5,10) Alloys[J]. Rare Metal Materials and Engineering, 2008, 37(12) |
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| Authors: | Li Guoqiang Cai Quan Zheng Lijing Li Huanxi |
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| Affiliation: | Li Guoqiang1,Cai Quan2,Zheng Lijing1,Li Huanxi1 (1. Beijing University of Aeronautics , Astronautics,Beijing 100083,China) (2. Beijing Synchrotron Radiation Facility,Beijing 100039,China) |
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| Abstract: | Local atomic structures of amorphous Mg65Cu25YxGd10-x (x=0,5,10) alloys and the difference in glass-forming ability of them have been studied by extended X-ray absorption fine structure (EXAFS). Results showed that the coordination number around Cu atoms in amorphous Mg65Cu25YxGd10-x alloys increased monotonously while the distance between Cu atoms and their nearest neighbor atoms decreased slightly with the increase of element Gd content, indicating the short range order around the Cu atoms improved. The f... |
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| Keywords: | EXAFS |
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