Dislocation self-interaction in TiAl: Evolution of super-dislocation dipoles revealed by atomistic simulations

doi:10.1016/j.jmst.2020.03.091

IMR OpenIR

	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
通讯作者	Wang, H.(haowang@imr.ac.cn) ; Xu, D. S.(dsxu@imr.ac.cn)
	2021-04-10
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	69 页码:138-147
摘要	As 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.
关键词	TiAl Dislocation Dipole Mechanical property Atomistic simulation
资助者	National 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
DOI	10.1016/j.jmst.2020.03.091
收录类别	SCI
语种	英语
资助项目	National 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研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000620808800016
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：11[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/321006/161064
专题	中国科学院金属研究所
通讯作者	Wang, H.; Xu, D. S.
作者单位	1.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
推荐引用方式 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.