The material-dependence of plasticity in metallic glasses: An origin from shear band thermology

被引：13
作者：
Yang, G. N.
Shao, Y. [1 ]
Yao, K. F. [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 96卷
基金：
中国国家自然科学基金;
关键词：
Metallic glass; Shear band; Plasticity; FRACTURE-TOUGHNESS; THERMAL-DIFFUSIVITY; SERRATED FLOW; DEFORMATION; MECHANISM; CONDUCTIVITY; DUCTILITY; SIZE; COMPRESSION; TEMPERATURE;
D O I：
10.1016/j.matdes.2016.02.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The material origin of plasticity in metallic glasses is a puzzled question for decades. In this work, we tackled this question from a perspective of excessive heating. With a simultaneous heat generation and dissipation model to describe the spatial and temporal distribution of temperature-rise in shear bands, an upper bound of temperature-rise of about tens of Kelvins was noticed for the reported stable shear banding. These results implied the fracture of metallic glasses being triggered at some critical temperature-rise. Based on the thermal property data of a series of bulk metallic glasses (BMGs) with different plasticity, a trend of low temperature-rise in large plasticity BMGs was revealed. A new material-dependent parameter based on thermal properties was then suggested to estimate or predict the plasticity in metallic glasses. This study provides a reasonable physical picture to understand the origin of BMGs' fracture and their different plasticity, which sheds a light to the understanding of the complex mechanical properties of these materials. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：189 / 194
页数：6
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