Deformation mechanism crossover and mechanical behaviour in nanocrystalline materials.
作者： V. Yamakov , D. Wolf , S. R. Phillpot , A. K. Mukherjee , H. Gleiter
DOI: 10.1080/09500830031000120891
关键词: Composite material 、 Materials science 、 Metallurgy 、 Nanocrystalline material 、 Strain hardening exponent 、 Deformation mechanism 、 Grain size 、 Plasticity 、 Grain boundary 、 Tensile testing 、 Grain boundary strengthening
摘要: We use molecular dynamics simulations to elucidate the transition with decreasing grain size from a dislocation- grain-boundary-based deformation mechanism in nanocrystalline fcc metals. Our reveal that this crossover is accompanied by pronounced mechanical behaviour of material; namely, at where occurs (the 'strongest size'), strain rate under tensile elongation goes through minimum. This simultaneous both and corresponding offers an explanation for experimentally observed yield strength materials, Hall-Petch hardening 'inverse Hall-Petch' softening.
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