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Incipient plasticity and activation volume of dislocation nucleation for TiZrNbTaMo high-entropy alloys characterized by nanoindentation
Wang, Shao-Ping; Xu, Jian
2019-05-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume35Issue:5Pages:812-816
AbstractWith 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.
KeywordHigh-entropy alloys Nanoindentation Refractory metals BCC phase Incipient plasticity
Indexed BySCI
Language英语
WOS IDWOS:000460640200014
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81150
Collection中国科学院金属研究所
Recommended Citation
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.
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