Deformation induced grain boundary segregation in nanolaminated Al-Cu alloy

doi:10.1016/j.actamat.2019.10.036

CORC > 金属研究所 > 中国科学院金属研究所

	Deformation induced grain boundary segregation in nanolaminated Al-Cu alloy
	Xu, W.1,2; Liu, X. C.1; Li, X. Y.1; Lu, K.1
刊名	ACTA MATERIALIA
	2020
卷号	182 页码:207-214
关键词	Nanolaminated structure Al-Cu alloy Grain boundary segregation Surface mechanical grinding treatment
ISSN号	1359-6454
DOI	10.1016/j.actamat.2019.10.036
通讯作者	Lu, K.(lu@imr.ac.cn)
英文摘要	A gradient nanostructured surface layer was formed in an Al-4 wt%Cu alloy processed by means of surface mechanical grinding treatment at liquid nitrogen temperature. Within the deformed surface layer, laminated structures with a wide range of thickness were formed. With a decreasing depth from the treated surface, lamellae thickness decreases accompanied by an increased fraction of high angle grain boundaries (HAGBs) from 10% to 70%. In the topmost surface layer, nanolaminated (NL) structures were found with an average thickness as small as 28 nm and a HAGB fraction of 70%. Composition analysis indicated that Cu atoms segregate at NL boundaries in the as-prepared sample, Cu concentration is about 3-4 times higher than that in the lattice. The obvious grain boundary (GB) segregation of Cu induced by cryogenic plastic deformation is attributed dynamic interaction between solute atoms with gliding dislocations. GB segregation of Cu is responsible for the stabilization of the NL structures with a much finer structural size than that in pure Al, resulting in higher hardness. The deformation-induced GB segregation provides an alternative strategy to achieving stable high strength nanostructures in Al alloys. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	Ministry of Science and Technology of the People's Republic of China[2017YFA0204401] ; Ministry of Science and Technology of the People's Republic of China[2017YFA0204402] ; National Natural Science Foundation of China[51601195] ; IMR SYNL-T.S. Ice Research Fellowship
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000501655200020
资助机构	Ministry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; IMR SYNL-T.S. Ice Research Fellowship
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/136240]
专题	金属研究所_中国科学院金属研究所
通讯作者	Lu, K.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Xu, W.,Liu, X. C.,Li, X. Y.,et al. Deformation induced grain boundary segregation in nanolaminated Al-Cu alloy[J]. ACTA MATERIALIA,2020,182:207-214.
APA	Xu, W.,Liu, X. C.,Li, X. Y.,&Lu, K..(2020).Deformation induced grain boundary segregation in nanolaminated Al-Cu alloy.ACTA MATERIALIA,182,207-214.
MLA	Xu, W.,et al."Deformation induced grain boundary segregation in nanolaminated Al-Cu alloy".ACTA MATERIALIA 182(2020):207-214.