期刊
SCIENCE
卷 362, 期 6414, 页码 559-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau1925
关键词
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资金
- NSFC [51471172, U1608257]
- Key Research Program of Frontier Science, CAS
- National Basic Research Program of China (973 Program) [2012CB932202]
- NSFC International collaboration grant [51420105001]
- NSF [DMR-1709318]
- XSEDE [MS090046]
Gradient structures exist ubiquitously in nature and are increasingly being introduced in engineering. However, understanding structural gradient-related mechanical behaviors in all gradient structures, including those in engineering materials, has been challenging. We explored the mechanical performance of a gradient nanotwinned structure with highly tunable structural gradients in pure copper. A large structural gradient allows for superior work hardening and strength that can exceed those of the strongest component of the gradient structure. We found through systematic experiments and atomistic simulations that this unusual behavior is afforded by a unique patterning of ultrahigh densities of dislocations in the grain interiors. These observations not only shed light on gradient structures, but may also indicate a promising route for improving the mechanical properties of materials through gradient design.
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