Temperature dependence of shear transformation zone volume and plasticity in bulk metallic glass

被引：3

作者：

Ren, Zhi Qiang ^{[1
]}

Liu, Yu Wei ^{[1
]}

Liu, Ying ^{[1
]}

Wang, Jing Tao ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210014, Peoples R China

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2023年 / 601卷

关键词：

Bulk metallic glass; Shear transformation zone volume; Shear band density; Plasticity; DEFORMATION KINETICS; STRENGTH; BEHAVIOR; ALLOY; FLOW;

D O I：

10.1016/j.jnoncrysol.2022.122048

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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.

引用

页数：7

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