How does the structural inhomogeneity influence the shear band behaviours of metallic glasses

被引：3

作者：

Yang, G. N. ^{[1
,2
,3
,4
]}

Shao, Y. ^{[2
,3
]}

Liu, C. T. ^{[4
]}

Yao, K. F. ^{[2
,3
]}

机构：

[1] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou, Guangdong, Peoples R China

[2] Tsinghua Univ, Sch Mat Sci & Engn, Beijing, Peoples R China

[3] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing, Peoples R China

[4] City Univ Hong Kong, Ctr Adv Struct Mat, Dept Mech & Biomech Engn, Hong Kong, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE | 2020年 / 100卷 / 13期

基金：

中国国家自然科学基金;

关键词：

Metallic glasses; shear bands; free volume; plastic deformation; structural inhomogeneity; PLASTICITY; ORIGIN; DEFORMATION; INSTABILITY; DILATATION; DYNAMICS; VOLUME; ONSET; RATIO; FLOW;

D O I：

10.1080/14786435.2020.1730461

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here we propose a model to understand the influence of structural inhomogeneity on the shear band behaviours of metallic glasses. By considering the inhomogeneous structure and stress concentration, the model predicts that the strain for shear band nucleation in metallic glasses can be variable and far below the theoretical elastic limit. During sliding, the shear band will approach a dynamic equilibrium state of balanced free volume generation and annihilation. By considering the accumulation of irreversible structure change, the shear band will finally develop into fracture. Under fluctuating load, the shear band shows an 'activate-arrest' behaviour, which results from a delayed response to the external load change. These results reasonably explain and correlate the physics behind the elastic limit, stick-slip shear band behaviour, implicit shear events, and shear band fracture in metallic glasses. The study can provide another perspective and platform to understand the correlations between structural inhomogeneity and shear band behaviours in metallic glasses, and further explore other shear band related phenomena not only in metallic glasses but also in the class of shear-softened materials.

引用

页码：1663 / 1681

页数：19

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