Quantitative analysis of the yield behavior of a &lt; 1 1 1 &gt;/2 screw dislocation in alpha-iron

doi:10.1016/j.commatsci.2018.02.035

IMR OpenIR

	Quantitative analysis of the yield behavior of a < 1 1 1 >/2 screw dislocation in alpha-iron
	Xia, Z. Y.1,2; Zhang, Z. J.1; Yang, J. B.1,2; Zhang, Z. F.1,2
通讯作者	Yang, J. B.(jbyang@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
	2018-06-01
发表期刊	COMPUTATIONAL MATERIALS SCIENCE
ISSN	0927-0256
卷号	148 页码:207-215
摘要	In previous work, bond-order potentials (BOPS) have been used to establish a general yield criterion, different from the Schmid law, for the glide of < 1 1 1 >/2 screw dislocations on {1 1 0} planes in body-centered cubic metals, while their applications are restricted to the 2D simulations at 0 K because of their low computational efficiency. On the other hand, embedded-atom-method (EAM) potentials have been generally employed for long dislocation segments at finite temperatures, but there is no study to clarify whether or not they can reproduce the yield criteria revealed by the BOPs. In this work, systematic atomistic simulations with an EAM potential have been performed to calculate the behaviors of < 1 1 1 >/2 screw dislocations in alpha-iron under different loading conditions. We find that at 0 K, the simulation results can be well explained by the general yield criterion when the glide is restricted to {1 1 0} planes. Under uniaxial loadings, the activated slip systems are consistent with the experimental observations. At finite temperatures, as a preliminary attempt, the influence of the non-glide stress on the slip planes is presented, which could not be rationalized by the yield criterion at 0 K because extra effect from temperatures has come into the picture. (C) 2018 Elsevier B.V. All rights reserved.
关键词	Body centered cubic Screw dislocations Core structure Non-glide stresses
资助者	Program of One Hundred Talented People of the Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.commatsci.2018.02.035
收录类别	SCI
语种	英语
资助项目	Program of One Hundred Talented People of the Chinese Academy of Sciences ; National Natural Science Foundation of China (NSFC)[51331007] ; National Natural Science Foundation of China (NSFC)[51571198] ; National Natural Science Foundation of China (NSFC)[51501197] ; National Natural Science Foundation of China (NSFC)[51771206] ; National Natural Science Foundation of China (NSFC)[51401207]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000428907600023
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：5[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/321006/127721
专题	中国科学院金属研究所
通讯作者	Yang, J. B.; Zhang, Z. F.
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Xia, Z. Y.,Zhang, Z. J.,Yang, J. B.,et al. Quantitative analysis of the yield behavior of a < 1 1 1 >/2 screw dislocation in alpha-iron[J]. COMPUTATIONAL MATERIALS SCIENCE,2018,148:207-215.
APA	Xia, Z. Y.,Zhang, Z. J.,Yang, J. B.,&Zhang, Z. F..(2018).Quantitative analysis of the yield behavior of a < 1 1 1 >/2 screw dislocation in alpha-iron.COMPUTATIONAL MATERIALS SCIENCE,148,207-215.
MLA	Xia, Z. Y.,et al."Quantitative analysis of the yield behavior of a < 1 1 1 >/2 screw dislocation in alpha-iron".COMPUTATIONAL MATERIALS SCIENCE 148(2018):207-215.