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Extraordinary strain hardening by gradient structure
文献类型：期刊论文
| 作者 | Wu XL(武晓雷) ; Jiang P(姜萍); Chen L(陈柳); Yuan FP(袁福平); Zhu YT
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| 刊名 | Proceeding of the National Academy of Sciences of the United States of America
 |
| 出版日期 | 2014-05 |
| 卷号 | 111期号:20页码:7197-7201 |
| 通讯作者邮箱 | xlwu@imech.ac.cn |
| 关键词 | gradient structured metal nanocrystalline metal |
| ISSN号 | 0027-8424 |
| 产权排序 | [Wu, XiaoLei; Jiang, Ping; Chen, Liu; Yuan, Fuping] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Zhu, Yuntian T.] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA; [Zhu, Yuntian T.] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China |
| 通讯作者 | 武晓雷 ; Zhu YT |
| 中文摘要 | Gradient structures have evolved over millions of years through natural selection and optimization in many biological systems such as bones and plant stems, where the structures change gradually from the surface to interior. The advantage of gradient structures is their maximization of physical and mechanical performance while minimizing material cost. Here we report that the gradient structure in engineering materials such as metals renders a unique extra strain hardening, which leads to high ductility. The grain-size gradient under uniaxial tension induces a macroscopic strain gradient and converts the applied uniaxial stress to multiaxial stresses due to the evolution of incompatible deformation along the gradient depth. Thereby the accumulation and interaction of dislocations are promoted, resulting in an extra strain hardening and an obvious strain hardening rate up-turn. Such extraordinary strain hardening, which is inherent to gradient structures and does not exist in homogeneous materials, provides a hitherto unknown strategy to develop strong and ductile materials by architecting heterogeneous nanostructures. |
| 分类号 | 一类 |
| 收录类别 | SCI |
| 资助信息 | X.W., P.J., L. C., and F.Y. are funded by the National Natural Science Foundation of China (11072243, 11222224, 50571110, and 11021262) and 973 Program of China (2012CB92203, 2012CB937500 6138504). Y.T.Z. is funded by the US Army Research Office under Grants W911NF-09-1-0427 and W911QX-08-C-0083 and by the Nanjing University of Science and Technology. |
| 原文出处 | http://dx.doi.org/10.1073/pnas.1324069111 |
| 语种 | 英语 |
| WOS记录号 | WOS:000336168100020 |
| 公开日期 | 2014-05-28 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/48829]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wu XL,Jiang P,Chen L,et al. Extraordinary strain hardening by gradient structure[J]. Proceeding of the National Academy of Sciences of the United States of America,2014,111(20):7197-7201. |
| APA | Wu XL,Jiang P,Chen L,Yuan FP,&Zhu YT.(2014).Extraordinary strain hardening by gradient structure.Proceeding of the National Academy of Sciences of the United States of America,111(20),7197-7201. |
| MLA | Wu XL,et al."Extraordinary strain hardening by gradient structure".Proceeding of the National Academy of Sciences of the United States of America 111.20(2014):7197-7201. |
入库方式： OAI收割
来源：力学研究所
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