Mechanism transition of cross slip with stress and temperature in face-centered cubic metals

doi:10.1016/j.jmst.2020.04.035

CORC > 金属研究所 > 中国科学院金属研究所

	Mechanism transition of cross slip with stress and temperature in face-centered cubic metals
	Li, K. Q.1,2; Zhang, Z. J.2; Yan, J. X.1,2; Yang, J. B.1,2; Zhang, Z. F.1,2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2020-11-15
卷号	57 页码:159-171
关键词	Cross-slip Molecular dynamics simulation Face-centered cubic metals Stacking fault energy
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.04.035
通讯作者	Yang, J. B.(ybyang@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
英文摘要	A < 110 >/2 screw dislocation is commonly dissociated into two < 112 >/6 Shockley partial dislocations on {111} planes in face-centered cubic metals. As the two partials are not purely screw, different mechanisms of cross-slip could take place, depending on the stacking fault energy, applied stress and temperature. It is crucial to classify the mechanisms of cross-slip because each mechanism possesses its own reaction path with a special activation process. In this work, molecular dynamics simulations have been performed systematically to explore the cross-slip mechanism under different stresses and temperatures in three different metals Ag, Cu and Ni that have different stacking fault energies of 17.8, 44.4 and 126.8 mJ/m(2), respectively. In Ag and Cu with low stacking fault energy, it is observed that the cross-slip mechanism of screw dislocations changes from the Fleischer obtuse angle (FLOA), to the Friedel-Escaig (FE), and then to the FL acute angle (FLAA) at low temperatures, with increasing the applied stress. However, when the temperature increases, the FE mechanism gradually becomes dominant, while the FLAA only occurs at the high stress region. In particular, the FLOA has not been observed in Ni because of its high stacking fault energy. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	Program of OneHundred Talented People of the Chinese Academy of Sciences ; National Natural Science Foundation of China[51871223] ; National Natural Science Foundation of China[51771206] ; National Natural Science Foundation of China[51790482]
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:000572537200016
资助机构	Program of OneHundred Talented People of the Chinese Academy of Sciences ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140623]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang, J. B.; Zhang, Z. F.
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, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, K. Q.,Zhang, Z. J.,Yan, J. X.,et al. Mechanism transition of cross slip with stress and temperature in face-centered cubic metals[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,57:159-171.
APA	Li, K. Q.,Zhang, Z. J.,Yan, J. X.,Yang, J. B.,&Zhang, Z. F..(2020).Mechanism transition of cross slip with stress and temperature in face-centered cubic metals.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,57,159-171.
MLA	Li, K. Q.,et al."Mechanism transition of cross slip with stress and temperature in face-centered cubic metals".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 57(2020):159-171.