Stress relaxation and the structure size-dependence of plastic deformation in nanotwinned copper
文献类型：期刊论文
| 作者 | L. Lu ; T. Zhu ; Y. F. Shen ; M. Dao ; K. Lu ; S. Suresh |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2009 |
| 卷号 | 57期号:17页码:5165-5173 |
| 关键词 | 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 |
| ISSN号 | 1359-6454 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32154]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：金属研究所
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