Temperature dependence of the yield stress of metallic nano-sized crystals |
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Authors: | Sergey Kotrechko |
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Institution: | G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of the Ukraine , 36 Vernadsky Av., 03142 Kiev, Ukraine |
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Abstract: | It is shown that the temperature effect on the variance of local shear stresses is the main factor pre-determining the temperature law of the yield stress of nano-sized crystals. The results of molecular dynamics simulations of uniaxial tension of Mo, α-Fe and W nanowires in three crystallographic directions (100], 110] and 111]) over the temperature range 100–1000 K are presented. It is found that within this temperature range, the yield stress of nano-sized crystals varies not exponentially, as for bulk single crystals, but is a parabolic function of temperature. |
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Keywords: | nano-sized crystals yield criteria temperature dependence atomic thermal vibration lattice instability |
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