| Stress relaxation and the structure size-dependence of plastic deformation in nanotwinned copper | |
| L. Lu; T. Zhu; Y. F. Shen; M. Dao; K. Lu; S. Suresh | |
| 2009 | |
| Source Publication | Acta Materialia
 |
| ISSN | 1359-6454 |
| Volume | 57Issue:17Pages:5165-5173 |
| Abstract | Stress-relaxation experiments were performed on nanotwinned Cu to characterize the twin size-dependence of the activation volume and mobile dislocation density. We find that the variation of activation volume as a function of twin lamellae thickness can be captured well by a Hall-Petch-type relation. This structure size-dependence is interpreted to arise from a transition of the rate-controlling mechanism from intra-twin to twin boundary-mediated processes with decreasing twin thickness. Furthermore, we find that the exhaustion rate of mobile dislocations reduces with decreasing twin thickness. Such a twin size-dependence is attributed to the increased strain-hardening rate associated with a high density of coherent twin boundaries. Our results demonstrate that twin boundary-mediated dislocation processes can effectively promote the strain hardening and preserve mobile dislocations, leading to ultrahigh strength while retaining ductility in nanotwinned Cu. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| description.department | [lu, lei; shen, yongfeng; lu, k.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [lu, lei; dao, ming; suresh, subra] mit, dept mat sci & engn, cambridge, ma 02139 usa. [zhu, ting] georgia inst technol, woodruff sch mech engn, atlanta, ga 30332 usa.;lu, l (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;llu@imr.ac.cn |
| Keyword | Nanoscale Twins Stress Relaxation Activation Volume Mobile Dislocation Density Plastic Deformation Kinetics Strain-rate Sensitivity Coherent Twin Boundaries Centered-cubic Metals Nano-scale Twins Nanoscale Twins Nanostructured Metals Activation Volume Single-crystals Nanocrystalline Ductility |
| URL | 查看原文 |
| WOS ID | WOS:000270691000023 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/32154 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | L. Lu,T. Zhu,Y. F. Shen,et al. Stress relaxation and the structure size-dependence of plastic deformation in nanotwinned copper[J]. Acta Materialia,2009,57(17):5165-5173. |
| APA | L. Lu,T. Zhu,Y. F. Shen,M. Dao,K. Lu,&S. Suresh.(2009).Stress relaxation and the structure size-dependence of plastic deformation in nanotwinned copper.Acta Materialia,57(17),5165-5173. |
| MLA | L. Lu,et al."Stress relaxation and the structure size-dependence of plastic deformation in nanotwinned copper".Acta Materialia 57.17(2009):5165-5173. |
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