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

doi:10.1016/j.actamat.2021.117170

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	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
刊名	ACTA MATERIALIA
	2021-09-15
卷号	217 页码:15
关键词	Mg alloy Dislocation Twinning Interfacial defects Ductility
ISSN号	1359-6454
DOI	10.1016/j.actamat.2021.117170
通讯作者	Yang, Zhiqing(yangzq@imr.ac.cn)
英文摘要	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.
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
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000691327100020
资助机构	National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Ji Hua Laboratory
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/166859]
专题	金属研究所_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.