Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys

doi:10.1016/j.actamat.2021.117170

IMR OpenIR

	Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys
	Zhou, Xinzhe 1,2; Su, Huhu 1,3; Ye, Hengqiang 2; Yang, Zhiqing 1,2
通讯作者	Yang, Zhiqing(yangzq@imr.ac.cn)
	2021-09-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	217 页码:15
摘要	Reactions of {10 (1) over bar2} twin boundaries (TBs) with dislocations in a Mg alloy subjected to cyclic deformation were studied and modeled, based on atomic-resolution observations, theory of interfacial defects and molecular dynamics (MD) simulations. Atomic-resolution observations provide evidence for occurrence of reactions of {10 (1) over bar2} TBs with basal < a(60)> and basal-dissociated < c + a > dislocations upon back and forth migration of {10 (1) over bar2} TBs, respectively, during cyclic deformation. MD simulations show that immobile basal-dissociated < c + a(s)>,< c + a(60)> and < c > dislocations in Mg can be incorporated into {10 (1) over bar2} TBs to produce steps which can move together with the TBs upon twinning/detwinning under low shear stresses. And such steps can usually emit < a(60)> dislocations under simultaneous application of shear and normal stresses. Importantly, the normal stresses required to transmute immobile basal-dissociated < c + a > dislocations to glissile < a(60)> dislocations are much lower than those required to transmute basal < a(60)> dislocations to < c + a > dislocations during {10 (1) over bar2} deformation twinning. Our results may have implications for comprehensive understanding of the roles of deformation twinning, < c + a > dislocations, and their interactions/reactions in plastic deformation of Mg alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Mg alloy Dislocation Twinning Interfacial defects Ductility
资助者	National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Ji Hua Laboratory
DOI	10.1016/j.actamat.2021.117170
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51971225] ; National Natural Science Foundation of China[51771202] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-JSC027] ; Ji Hua Laboratory[X210141TL210]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000691327100020
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：22[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/321006/166860
专题	中国科学院金属研究所
通讯作者	Yang, Zhiqing
作者单位	1.Univ Sci & Technol China, Chinese Acad Sci, Sch Mat Sci & Engn, Inst Met Res,Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Ji Hua Lab, Foshan 528200, Peoples R China 3.Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Mat Laminating Fabricat & Interfa, Tianjin 300130, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Xinzhe,Su, Huhu,Ye, Hengqiang,et al. Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys[J]. ACTA MATERIALIA,2021,217:15.
APA	Zhou, Xinzhe,Su, Huhu,Ye, Hengqiang,&Yang, Zhiqing.(2021).Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys.ACTA MATERIALIA,217,15.
MLA	Zhou, Xinzhe,et al."Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys".ACTA MATERIALIA 217(2021):15.