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Dislocation self-interaction in TiAl: Evolution of super-dislocation dipoles revealed by atomistic simulations
Zhen, Z.1,2; Wang, H.1,2,3; Teng, C. Y.4; Bai, C. G.1,2; Xu, D. S.1,2; Yang, R.1,2
Corresponding AuthorWang, H.(haowang@imr.ac.cn) ; Xu, D. S.(dsxu@imr.ac.cn)
2021-04-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume69Pages:138-147
AbstractAs one of the fundamental outcomes of dislocation self-interaction, dislocation dipoles have an important influence on the plastic deformation of materials, especially on fatigue and creep. In this work, super-dislocation dipoles in gamma-TiAl and alpha(2)-Ti3Al were systematically investigated by atomistic simulations, with a variety of dipole heights, orientations and annealing temperatures. The results indicate that non-screw super-dipoles transform into locally stable dipolar or reconstructed cores at low temperature, while into isolated or interconnected point defect clusters and stacking fault tetrahedra at high temperature via short-range diffusion. Non-screw super-dipoles in gamma-TiAl and alpha(2)-Ti3Al exhibit similar features as fcc and hcp metals, respectively. Generally, over long-term annealing where diffusion is significant, 60 degrees superdipoles in gamma-TiAl are stable, whereas the stability of super-dipoles in alpha(2)-Ti3Al increases with dipole height and orientation angle. The influence on mechanical properties can be well evaluated by integrating these results into mesoscale or constitutive models. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordTiAl Dislocation Dipole Mechanical property Atomistic simulation
Funding OrganizationNational Key Research and Development Program of China ; Natural Science Foundation of China ; Frontier and Key Projects of theChinese Academy of Sciences ; Natural Science Foundation of Liaoning ; Aeronautical Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Liaoning BaiQianWan Talents Program
DOI10.1016/j.jmst.2020.03.091
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0701304] ; National Key Research and Development Program of China[2017YFB0306201] ; Natural Science Foundation of China[51671195] ; Natural Science Foundation of China[91960202] ; Frontier and Key Projects of theChinese Academy of Sciences[QYZDJ-SSW-JSC031-01] ; Frontier and Key Projects of theChinese Academy of Sciences[XXH13506304] ; Natural Science Foundation of Liaoning[20180510032] ; Aeronautical Science Foundation of China[20160292002] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDC01000000] ; Liaoning BaiQianWan Talents Program
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000620808800016
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161064
Collection中国科学院金属研究所
Corresponding AuthorWang, H.; Xu, D. S.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
4.AVIC China Aeropolytechnol Estab, Lab Fundamental Res, Beijing 100028, Peoples R China
Recommended Citation
GB/T 7714
Zhen, Z.,Wang, H.,Teng, C. Y.,et al. Dislocation self-interaction in TiAl: Evolution of super-dislocation dipoles revealed by atomistic simulations[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,69:138-147.
APA Zhen, Z.,Wang, H.,Teng, C. Y.,Bai, C. G.,Xu, D. S.,&Yang, R..(2021).Dislocation self-interaction in TiAl: Evolution of super-dislocation dipoles revealed by atomistic simulations.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,69,138-147.
MLA Zhen, Z.,et al."Dislocation self-interaction in TiAl: Evolution of super-dislocation dipoles revealed by atomistic simulations".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 69(2021):138-147.
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