| 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 Author | Lu, K.(lu@imr.ac.cn) |
| 2020 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 182Pages:207-214 |
| Abstract | 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. |
| Keyword | Nanolaminated structure Al-Cu alloy Grain boundary segregation Surface mechanical grinding treatment |
| Funding Organization | 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 |
| DOI | 10.1016/j.actamat.2019.10.036 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000501655200020 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/136242 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Lu, K. |
| Affiliation | 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 |
| 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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