4.6 Article

Atomic simulations of effect of grain size on deformation behavior of nano-polycrystal magnesium

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JOURNAL OF APPLIED PHYSICS
卷 111, 期 4, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.3687908

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  1. National Natural Science Foundation of China [10902083, 10932008]

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The effect of grain size and temperature on the mechanical behavior of nano-polycrystal magnesium under tensile load is investigated using molecular dynamics simulation. The results indicate that the average flow stress of nano-polycrystal magnesium decreases with decreasing grain size, exhibiting a breakdown in the Hall-Petch relation when grain size is smaller than a critical size. The results also show that crack formation during tension is a cause of reduced flow stress of nano-polycrystal magnesium with a large grain size and that the Young's modulus of nano-polycrystal magnesium increases with increasing grain size. Furthermore, we find that the deformation behavior of nano-polycrystal magnesium obviously depends on temperatures. (C) 2012 American Institute of Physics. [http:/dx. doi. org/10.1063/1.3687908]

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