Atomistic simulations of correlations between volumetric change and shear softening in amorphous metals
Atomistic simulations of correlations between volumetric change and shear softening in amorphous metals
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DOI：
10.1103/physrevb.75.094101
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发表时间：
2007-03-01
影响因子：
3.7
通讯作者：
Li, Mo
中科院分区：
文献类型：
--
作者：
Li, Qi-Kai;Li, Mo
本文研究了剪切变形下模型非晶态金属中原子的体积变化及其与剪切软化之间的定量关系。从广泛的原子模型，我们表明，局部体积变化或自由体积发生在变形过程中，即使在低应变和塑性变形套在自由体积的临界量。局部原子体积变化的直接结果是非晶态金属的局部剪切模量的减小。因此，剪切带或剪切局部化是体积膨胀引起的机械软化的结果。
In this paper we investigate atomic volume change and the quantitative correlations between the volume changes and shear softening in a model amorphous metal subjected to shear deformation. From extensive atomistic modeling, we show that the local volumetric change or free volume does occur during the deformation process, even at low strains; and plastic deformation sets in at a critical amount of free volume. A direct consequence of the local atomic volume change is the decrease of the local shear modulus of the amorphous metal. Shear banding or shear localization is, therefore, a result of the volume-expansion-induced mechanical softening.