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Extraordinary strain hardening by gradient structure
Wu XL(武晓雷); Jiang P(姜萍); Chen L(陈柳); Yuan FP(袁福平); Zhu YT
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
2014-05
Volume111Issue:20Pages:7197-7201
ISSN0027-8424
Abstract

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.

KeywordGradient Structured Metal Nanocrystalline Metal
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Indexed BySCI
Language英语
WOS IDWOS:000336168100020
Funding OrganizationX.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.
DepartmentLNM材料介观力学性能的表征
Classification一类
Citation statistics
Cited Times:302[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48829
Collection非线性力学国家重点实验室
Corresponding AuthorWu XL(武晓雷); Zhu YT
Recommended Citation
GB/T 7714
Wu XL,Jiang P,Chen L,et al. Extraordinary strain hardening by gradient structure[J]. PROCEEDINGS 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.PROCEEDINGS 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".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 111.20(2014):7197-7201.
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