Unraveling the origin of extra strengthening in gradient nanotwinned metals

Author:

Cheng Zhao1,Bu Linfeng12,Zhang Yin3,Wu HengAn2,Zhu Ting3,Gao Huajian45ORCID,Lu Lei1ORCID

Affiliation:

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

2. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China

3. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

4. School of Mechanical and Aerospace Engineering, College of Engineering, Nanyang Technological University, Singapore 639798, Singapore

5. Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), Singapore 138632, Singapore

Abstract

Significance The emergence of heterogeneous nanostructured metals offers exciting opportunities for achieving extraordinary mechanical properties. Gradient nanotwinned Cu is a prominent class of heterogeneous nanostructured metals, as it exhibits a superior extra strength compared with nongradient counterparts. However, the mechanistic origin of the extra strength remains elusive. At a more fundamental level, the strengthening effects of plastically inhomogeneous deformation in heterogeneous nanostructured metals are not well understood. Here, we use a combination of controlled material processing, back-stress measurement, dislocation microstructure characterization, and strain gradient plasticity modeling to unravel the origin of the extra strength in gradient nanotwinned Cu. The combined experimental and modeling framework may be applied to accelerate the rational design of heterogeneous nanostructured metals with enhanced mechanical performance.

Funder

National Natural Science Foundation of China

Key Research program of Frontier Science and International partnership program

Liaoning Revitalization Talents Program

China Postdoctoral Science Foundation

Nanyang Technological University

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

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