剪切矩阵
非晶态金属
可塑性
材料科学
剪切(地质)
剪切带
体积热力学
无定形固体
凝聚态物理
金属
复合材料
热力学
冶金
合金
化学
结晶学
物理
作者
Zhiqiang Ren,Yu Wei Liu,Ying Liu,Jing Tao Wang
标识
DOI:10.1016/j.jnoncrysol.2022.122048
摘要
In this paper, a theoretical formulation for shear transformation zone (STZ) volume, shear band density, and plasticity are presented and temperature dependence of these parameters are discussed. In particular, the strain energy barrier for a shear cooperative transformation is modeled following the Johnson and Samwer approach for amorphous metallic glasses; positive temperature dependence of the STZ volume and negative temperature dependence of the shear band density are formulated, based on which a significant improvement in plasticity at lower temperatures is predicted. Experimental data on the plasticity for Vit105 bulk metallic glass - obtained from the present compression tests and also from the literature - show negative temperature dependence, which is consistent with the prediction of the analytical formulation.
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