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Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys
Wang, XW; Zhong YR(钟玉荣); Wang BY(王宝义); Zhong, YR; Wang, BY; Zhang, HY
2009
发表期刊JOURNAL OF MATERIALS RESEARCH
卷号24期号:5页码:1791-1794
通讯作者[Wang, Xiaowei] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China ; [Zhong, Yurong ; Wang, Baoyi] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China ; [Zhang, Hongyan] Univ Toledo, Dept MIME, Toledo, OH 43606 USA
文章类型Article
摘要The results of positron lifetime and Doppler broadening spectrum of defects in the hydrogen charged non-heat treatable 5xxx Al alloys are presented in this work. The yield stress of the sample was reduced for about 20 MPa after hydrogen was charged. A similar trend was observed in positron lifetime measurement, as the average lifetime tau(av) descended remarkably to almost the level of Al matrix. The change in coincidence Doppler broadening (CDB) spectroscopy was also significant, exhibited by the characteristic change in CDB radio curves of a sample before and after hydrogen was charged. After hydrogen charging, there is an obvious enhancement in the high momentum region compensating dehancement in the low momentum region. This indicates the existence of hydrogen filling effect. The vacancies around the Mg atoms should be preferential filling sites for hydrogen because Mg has a strong affinity for hydrogen. The formation of an Mg-H bond parallel to a grain boundary is an important factor in weakening the grain boundary cohesion.
学科领域Materials Science
研究领域[WOS]Materials Science ; Materials Science
DOI10.1557/JMR.2009.0195
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语种英语
研究领域[WOS]Materials Science ; Materials Science
WOS类目Materials Science, Multidisciplinary
WOS记录号WOS:000267207800028
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239527
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Wang, XW,Zhong YR,Wang BY,et al. Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys[J]. JOURNAL OF MATERIALS RESEARCH,2009,24(5):1791-1794.
APA Wang, XW,钟玉荣,王宝义,Zhong, YR,Wang, BY,&Zhang, HY.(2009).Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys.JOURNAL OF MATERIALS RESEARCH,24(5),1791-1794.
MLA Wang, XW,et al."Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys".JOURNAL OF MATERIALS RESEARCH 24.5(2009):1791-1794.
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