期刊
NANO LETTERS
卷 18, 期 10, 页码 6255-6264出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02375
关键词
Nanostructured metals; mechanical property; grain-boundary engineering; metal matrix composites; graphene
类别
资金
- Ministry of Science and Technology of China through the National Key RD Plan [2016YFE0130200, 2017YFB0703103]
- National Natural Science Foundation of China [51801120, 51771111, 51771110, 51671130, 51501111, 11522218]
- Science & Technology Committee of Shanghai Municipality [17520712400]
- U.S. National Science Foundation [DMR-1709318]
Grain refinement to the nano/ultrafine-grained regime can make metals several times stronger, but this process is usually accompanied by a dramatic loss of ductility. Such strength-ductility trade-off originates from a lack of strain-hardening capacity in tiny grains. Here, we present a strategy to regain the strain-hardening ability of high-strength metals by incorporation of extrinsic nanofillers at grain boundaries. We demonstrate that the dislocation storage ability in Cu grains can be considerably improved through this novel grain-boundary engineering approach, leading to a remarkably enhanced strain-hardening capacity and tensile ductility (uniform elongation). Experiments and large-scale atomistic simulations reveal that a key benefit of incorporated nanofillers is a reduction in the grain-boundary energy, enabling concurrent dislocation storage near the boundaries and in the Cu grain interior during straining. The strategy of grain-boundary engineering through nanofillers is easily controllable, generally applicable, and may open new avenues for producing nanostructured metals with extraordinary mechanical properties.
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