Journal
SCIENCE
Volume 331, Issue 6024, Pages 1587-1590Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1200177
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Funding
- Ministry of Science and Technology of China [2005CB623604, 2010DFB54010]
- National Natural Science Foundation [50890171, 50971122]
- Danish-Chinese Center for Nanometals [50911130230]
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Nano-grained (NG) metals are believed to be strong but intrinsically brittle: Free-standing NG metals usually exhibit a tensile uniform elongation of a few percent. When a NG copper film is confined by a coarse-grained (CG) copper substrate with a gradient grain-size transition, tensile plasticity can be achieved in the NG film where strain localization is suppressed. The gradient NG film exhibits a 10 times higher yield strength and a tensile plasticity comparable to that of the CG substrate and can sustain a tensile true strain exceeding 100% without cracking. A mechanically driven grain boundary migration process with a substantial concomitant grain growth dominates plastic deformation of the gradient NG structure. The extraordinary intrinsic plasticity of gradient NG structures offers their potential for use as advanced coatings of bulk materials.
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