| Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension | |
| Wang, J. J.1,2; Tao, N. R.1; Lu, K.1 | |
| Corresponding Author | Tao, N. R.(nrtao@imr.ac.cn) |
| 2019-11-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 180Pages:231-242 |
| Abstract | A gradient nanostructured (GNS) surface layer was induced on coarse-grained (CG) Cu and CuAl alloys by means of surface mechanical grinding treatment. The GNS/CG Cu-4.5Al sample subjected to tensile tests yields at a higher strength and fails at a higher uniform elongation (similar to 42%) in comparison with the GNS/CG Cu and Cu-2.2Al samples. The microstructures of the GNS/CG samples before and after tension at different strains were systematically investigated by transmission electron microscope. It is revealed that grain coarsening dominates the plastic deformation of nanograins in the GNS/CG Cu sample while the propensity of deformation twinning in nanograins increases in the GNS/CG CuAl samples. The experimental results suggested a transition of deformation mechanism of nanograins from grain coarsening to the partial dislocation associated deformation twinning in the GNS/CG Cu and CuAl alloys with increasing Al solute concentration. The obvious activation of deformation twinning accommodates the large tensile plasticity of the surface nanograins in the GNS/CG Cu-4.5Al sample. This work demonstrated that the partial dislocation associated deformation twinning is an effective deformation mechanism to retard the strain localization and to improve the tensile ductility of nanograins. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| Keyword | Gradient nanostructure Tensile Grain coarsening Deformation twinning CuAl alloys |
| Funding Organization | National Natural Science Foundation of China ; National Key R&D Program of China ; Key Research Program of Frontier Science, Chinese Academy of Sciences |
| DOI | 10.1016/j.actamat.2019.09.021 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51771196] ; National Key R&D Program of China[2017YFA0204401] ; National Key R&D Program of China[2017YFA0204402] ; Key Research Program of Frontier Science, Chinese Academy of Sciences |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000495519100023 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/136858 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Tao, N. R. |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, J. J.,Tao, N. R.,Lu, K.. Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension[J]. ACTA MATERIALIA,2019,180:231-242. |
| APA | Wang, J. J.,Tao, N. R.,&Lu, K..(2019).Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension.ACTA MATERIALIA,180,231-242. |
| MLA | Wang, J. J.,et al."Revealing the deformation mechanisms of nanograins in gradient nanostructured Cu and CuAl alloys under tension".ACTA MATERIALIA 180(2019):231-242. |
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