Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation

doi:10.1016/j.jmst.2018.11.014

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	Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation
	Wang, Shao-Ping 1,2; Xu, Jian 2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2019-05-01
卷号	35 期号:5 页码:812-816
关键词	High-entropy alloys Nanoindentation Refractory metals BCC phase Incipient plasticity
ISSN号	1005-0302
DOI	10.1016/j.jmst.2018.11.014
通讯作者	Xu, Jian(jianxu@imr.ac.cn)
英文摘要	With instrumented nanoindentation, incipient plasticity of two as-cast BCC TiZrNbTa and TiZrNbTaMo high-entropy alloys (HEAs) are investigated in terms of pop-in events during loading, to characterize the dislocation behavior in these solid-solution alloys. It is shown that the maximum shear stress (tau(max)) required for dislocation nucleation is determined to be 1/16-1/12 and 1/18-1/14 of shear modulus for the TiZrNbTa and TiZrNbTaMo HEAs, respectively, which is nearly comparative to the theoretical shear stress of these alloys. The activation volumes of dislocation nucleation the TiZrNbTa and TiZrNbTaMo HEAs are determined to be 1.2b(3) for and 1.3b(3), respectively, which is substantially irrespective of alloying with Mo. Furthermore, activation volumes of these two HEAs are on the order of cubic burger's vector and only one-third of the value for TiZrHfNb HEA, suggesting that a heterogeneous nucleation of dislocation took place in a way of direct atom-vacancy exchange, rather than of the cooperative motion of several atoms. These findings reveal the unique feature in deformation of BCC solid-solution complex alloys. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foundation of China[51571192]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000460640200014
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132375]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xu, Jian
作者单位	1.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shao-Ping,Xu, Jian. Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(5):812-816.
APA	Wang, Shao-Ping,&Xu, Jian.(2019).Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(5),812-816.
MLA	Wang, Shao-Ping,et al."Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.5(2019):812-816.