Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys

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	Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys
	X. W. Wang; Y. R. Zhong; B. Y. Wang; H. Y. Zhang
	2009
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	24 期号:5 页码:1791-1794
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.
部门归属	[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.;wang, xw (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china, peoples r china;xwang@imr.ac.cn
关键词	Aa5754 Alloys Annihilation
URL	查看原文
WOS记录号	WOS:000267207800028
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32392
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. W. Wang,Y. R. Zhong,B. Y. Wang,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	X. W. Wang,Y. R. Zhong,B. Y. Wang,&H. Y. Zhang.(2009).Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys.Journal of Materials Research,24(5),1791-1794.
MLA	X. W. Wang,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.