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Removing basal-dissociated < c plus a > dislocations by {10(1)over-bar2} deformation twinning in magnesium alloys
Zhou, Xinzhe1,2; Su, Huhu1,3; Ye, Hengqiang2; Yang, Zhiqing1,2
Corresponding AuthorYang, Zhiqing(yangzq@imr.ac.cn)
2021-09-15
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume217Pages:15
AbstractReactions 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.
KeywordMg alloy Dislocation Twinning Interfacial defects Ductility
Funding OrganizationNational Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Ji Hua Laboratory
DOI10.1016/j.actamat.2021.117170
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000691327100020
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166860
Collection中国科学院金属研究所
Corresponding AuthorYang, Zhiqing
Affiliation1.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
Recommended Citation
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.
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