Shock response of nanotwinned copper from large-scale molecular dynamics simulations
文献类型：期刊论文
| 作者 | Yuan FP(袁福平) ; Wu XL(武晓雷); Yuan, FP
|
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012-10-10 |
| 卷号 | 86期号:13页码:134108 |
| 通讯作者邮箱 | fpyuan@lnm.imech.ac.cn;xlwu@imech.ac.cn |
| 关键词 | Nanocrystalline Materials Ultrahigh Strength Maximum Strength FCC Metals Deformation Twin Compression Ductility Crystals Single |
| ISSN号 | 1098-0121 |
| 产权排序 | [Yuan, Fuping;Wu, Xiaolei] Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China |
| 通讯作者 | Yuan, FP ; Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China. |
| 中文摘要 | A series of large-scale molecular dynamics simulations have been performed to investigate the shock response of nanotwinned (NT) Cu, including shock-induced plasticity, strength behind the shock front, and spall behaviors. In this study, two configurations were investigated at an impact velocity of 600m/s, i.e., the practical NT polycrystalline Cu with an average grain size of 10 nm and the simple NT single-crystalline Cu with an impact direction of [11 (2) over bar]. In the NT polycrystalline Cu, the average flow stress behind the shock front first increases with decreasing twin-boundary spacing (TBS), reaching a maximum at a critical TBS, and then decreases as the TBS become even smaller. This trend of the average flow stress with decreasing TBS is due to two competitive dislocation activities under shock loading, with one being inclined to the twin boundaries (the dislocation-twin boundary intersecting) and the other parallel to the twin boundaries (detwinning with twin-boundary migration). Since voids always nucleate near the grain boundary (GB) junctions and then grow along the GBs to create spallation, no apparent correlation between the spall strength and TBS is observed in the NT polycrystalline Cu. However, the spall strengths of the NT single-crystalline Cu are found to increase with decreasing TBS. Two partial dislocation slips initiated from each twin boundary create voids at the intersections between the partial dislocation slips and twin boundaries. The smaller TBSs result in a larger number of twin boundaries and provide more nucleation sites for voids, requiring a higher tensile stress to create spallation in the NT single-crystalline Cu. These findings should provide insights for understanding the deformation physics of the NT metals subjected to shock loading. |
| 学科主题 | 损伤、破坏机理和微结构演化 |
| 分类号 | 二类/Q1 |
| 收录类别 | SCI |
| 资助信息 | The authors would like to acknowledge the financial support of 973 Program of China (Grants No. 2012CB932203, No. 2012CB937500, and No. 2010CB631004) and NSFC (Grants No. 11002151, No. 11222224, and No. 11072243). |
| 原文出处 | http://dx.doi.org/10.1103/PhysRevB.86.134108 |
| 语种 | 英语 |
| WOS记录号 | WOS:000309651000001 |
| 公开日期 | 2013-01-18 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/46718]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Yuan, FP |
| 推荐引用方式 GB/T 7714 | Yuan FP,Wu XL,Yuan, FP. Shock response of nanotwinned copper from large-scale molecular dynamics simulations[J]. PHYSICAL REVIEW B,2012,86(13):134108. |
| APA | 袁福平,武晓雷,&Yuan, FP.(2012).Shock response of nanotwinned copper from large-scale molecular dynamics simulations.PHYSICAL REVIEW B,86(13),134108. |
| MLA | 袁福平,et al."Shock response of nanotwinned copper from large-scale molecular dynamics simulations".PHYSICAL REVIEW B 86.13(2012):134108. |
入库方式： OAI收割
来源：力学研究所
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