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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
Corresponding AuthorLu, K.(lu@imr.ac.cn)
2020
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume182Pages:207-214
AbstractA 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.
KeywordNanolaminated structure Al-Cu alloy Grain boundary segregation Surface mechanical grinding treatment
Funding OrganizationMinistry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; IMR SYNL-T.S. Ice Research Fellowship
DOI10.1016/j.actamat.2019.10.036
Indexed BySCI
Language英语
Funding ProjectMinistry 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000501655200020
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136242
Collection中国科学院金属研究所
Corresponding AuthorLu, K.
Affiliation1.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
Recommended Citation
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.
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