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

doi:10.1016/j.jmst.2020.03.091

CORC > 金属研究所 > 中国科学院金属研究所

	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
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-04-10
卷号	69 页码:138-147
关键词	TiAl Dislocation Dipole Mechanical property Atomistic simulation
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.03.091
通讯作者	Wang, H.(haowang@imr.ac.cn) ; Xu, D. S.(dsxu@imr.ac.cn)
英文摘要	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.
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
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000620808800016
资助机构	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
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/161063]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, H.; Xu, D. S.
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, 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.