| Characterization of gradient plastic deformation in gradient nanotwinned Cu | |
| Cheng, Zhao1; Bu, Linfeng1,2; Zhang, Yin3; Wu, HengAn2; Zhu, Ting3; Lu, Lei1 | |
| Corresponding Author | Zhu, Ting(ting.zhu@me.gatech.edu) ; Lu, Lei(llu@imr.ac.cn) |
| 2023-03-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 246Pages:11 |
| Abstract | Gradient nanostructured (GNS) metals exhibit high overall extra strengths relative to their non-gradient coun-terparts. However, the spatial distribution of local extra strengths stemming from plastic strain gradients remains elusive. This work is focused on characterizing the gradient distribution of plastic strains in a representative GNS metal of gradient nanotwinned (GNT) Cu. Full-field strain mapping reveals the gradient distributions of lateral strains in the transverse cross section of GNT Cu samples undergoing uniaxial tensile deformation. We find that the lateral strain gradient increases but the maximum lateral strain difference decreases in GNT samples with increasing structural gradient. The latter arises because the softest layer with the lowest initial yield strength gains the largest local extra strength during tensile deformation, and vice versa. Such a gradient distribution of local extra strengths results from the combined strengthening effects of plastic strain gradient and grain size. These experimental results are used to inform a strain gradient plasticity model for revealing the gradient dis-tributions of local extra back stresses and local extra strengths with increasing load. The coupled experimental and modeling characterization of gradient plastic deformation provides an in-depth mechanistic understanding of the spatial-temporal evolution of gradient strengthening effects in gradient nanostructures. |
| Keyword | Gradient nanotwinned cu Structural gradient Distributions of gradient plastic strains Bundle of concentrated dislocations Back stress |
| Funding Organization | National Natural Science Foundation of China (NSFC) ; Key Research Program of Frontier Science and International Partnership Program ( ; China Postdoctoral Science Foundation ; IMR Innovation Fund |
| DOI | 10.1016/j.actamat.2023.118673 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China (NSFC)[51931010] ; National Natural Science Foundation of China (NSFC)[92163202] ; Key Research Program of Frontier Science and International Partnership Program ( ; China Postdoctoral Science Foundation ; IMR Innovation Fund ; [52001312] ; [GJHZ2029] ; [BX20190336] ; [2019M661150] ; [2021-PY02] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000919660000001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/175240 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Zhu, Ting; Lu, Lei |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, CAS Ctr Excellence Complex Syst Mech, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Peoples R China 3.Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA |
| Recommended Citation GB/T 7714 | Cheng, Zhao,Bu, Linfeng,Zhang, Yin,et al. Characterization of gradient plastic deformation in gradient nanotwinned Cu[J]. ACTA MATERIALIA,2023,246:11. |
| APA | Cheng, Zhao,Bu, Linfeng,Zhang, Yin,Wu, HengAn,Zhu, Ting,&Lu, Lei.(2023).Characterization of gradient plastic deformation in gradient nanotwinned Cu.ACTA MATERIALIA,246,11. |
| MLA | Cheng, Zhao,et al."Characterization of gradient plastic deformation in gradient nanotwinned Cu".ACTA MATERIALIA 246(2023):11. |
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