摘要 :
Twin boundary(TB)engineering has been widely applied to enhance the strength and plasticity of metals and alloys,but is rarely adopted in thermoelectric(TE)semiconductors.Our previous first-principles results showed that nanotwins...
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Twin boundary(TB)engineering has been widely applied to enhance the strength and plasticity of metals and alloys,but is rarely adopted in thermoelectric(TE)semiconductors.Our previous first-principles results showed that nanotwins can strengthen TE Indium Antimony(InSb)through In–Sb covalent bond rearrangement at the TBs.Herein,we further show that shear-induced deformation twinning enhances plasticity of InSb.We demonstrate this by employing large-scale molecular dynamics(MD)to follow the shear stress response of flawless single-crystal InSb along various slip systems.We observed that the maximum shear strain for the (111)[112] slip system can be up to 0.85 due to shear-induced deformation twinning.We attribute this deformation twinning to the“catching bond”involving breaking and re-formation of In–Sb bond in InSb.This finding opens up a strategy to increase the plasticity of TE InSb by deformation twinning,which is expected to be implemented in other isotypicⅢ–V semiconductors with zinc blende structure.
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摘要 :
A simple gravity drop experiment was run to investigate plastic deformation of powder aggregrate sprayed on a hard ball under impact of another free falling hard ball and measure coefficient of restitution and plastic strain of po...
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A simple gravity drop experiment was run to investigate plastic deformation of powder aggregrate sprayed on a hard ball under impact of another free falling hard ball and measure coefficient of restitution and plastic strain of powder aggregate. Experimental results show that coefficient of restitution and plastic strain of powder aggregate increase as the velocity of ball increases and initial height (h 0) of powder aggregate has great effects on plastic deformation of powder aggregate. At a higher initial height (h 0), much of kinetic energy is dissipated is interparticle frictional work and coefficient of restitution is very small. Plastic strain of powder aggregate first increases as h 0 increases until a maximum value and then decreases as h 0 increases.
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