期刊
SCIENCE
卷 342, 期 6156, 页码 337-340出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1242578
关键词
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资金
- Ministry of Science and Technology of China [2012CB932201]
- National Natural Science Foundation [51231006, 51171182]
- Danish-Chinese Center for Nanometals [51261130091, DNRF86-5]
Heavy plastic deformation may refine grains of metals and make them very strong. But the strain-induced refinement saturates at large strains, forming three-dimensional ultrafine-grained (3D UFG) structures with random orientations. Further refinement of this microstructure is limited because of the enhanced mobility of grain boundaries. Very-high-rate shear deformation with high strain gradients was applied in the top surface layer of bulk nickel, where a 2D nanometer-scale laminated structure was induced. The strongly textured nanolaminated structure (average lamellar thickness of 20 nanometers) with low-angle boundaries among the lamellae is ultrahard and ultrastable: It exhibits a hardness of 6.4 gigapascal-which is higher than any reported hardness of the UFG nickel-and a coarsening temperature of 40 kelvin above that in UFG nickel.
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