期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.01.099
关键词
Nano; Nickel; Texture; Grain growth; Strength; Ductility
An attractive microstructural possibility for enhancing the ductility of high-strength nanocrystals is to develop a bimodal grain-size distribution, in which the fine grains provide strength, and the coarser grains enable strain hardening. Annealing of nanocrystalline Ni over a range of temperatures and times led to microstructures with varying volume fractions of coarse grains and a change in texture. Tensile tests revealed a drastic reduction in ductility with increasing volume fraction of coarse grains. The reduction in ductility may be related to the segregation of sulphur to grain boundaries. (C) 2008 Elsevier B.V. All rights reserved.
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