期刊
JOURNAL OF MATERIALS SCIENCE
卷 55, 期 7, 页码 2661-2681出版社
SPRINGER
DOI: 10.1007/s10853-019-04160-w
关键词
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We review some of the factors that influence the hardness of polycrystalline materials with grain sizes less than 1 mu m. The fundamental physical mechanisms that govern the hardness of nanocrystalline materials are discussed. The recently proposed dislocation curvature model for grain size-dependent strengthening and the 60-year-old Hall-Petch relationship are compared. For grains less than 30 nm in size, there is evidence for a transition from dislocation-based plasticity to grain boundary sliding, rotation, or diffusion as the main mechanism responsible for hardness. The evidence surrounding the inverse Hall-Petch phenomenon is found to be inconclusive due to processing artefacts, grain growth effects, and errors associated with the conversion of hardness to yield strength in nanocrystalline materials.
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