Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation

被引：0
作者：
M.Q.Jiang [1 ]
G.Wilde [2 ]
F.Jiang [3 ]
L.H.Dai [1 ]
机构：
[1] State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences
[2] State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University
[3] Institute of Materials Physics, Westf?lische Wilhelms-Universit?t Münster
来源：
Theoretical & Applied Mechanics Letters | 2015年 / 5 卷 / 05期
关键词：
Ductile-to-brittle transition; Metallic glass; Fracture; Shear transformation zone; Tension transformation zone;
D O I：
暂无
中图分类号：
O346.1 [断裂理论];
学科分类号：
080102 ;
摘要：
A theoretical model that takes into account the free-volume aided cooperative shearing of shear transformation zones(STZs) is developed to quantitatively understand the ductile-to-brittle transition(DBT) of metallic glasses. The STZ dilatational strain is defined as the ratio of STZ-activated free volume to STZ volume itself. The model demonstrates that the STZ dilatational strain will increase drastically and exceed the characteristic shear strain of STZ as temperature decreases below a critical value. This critical temperature is in good agreement with the experimentally measured DBT temperature. Our results suggest that the DBT of metallic glasses is underpinned by the transition of atomic-cluster motions from STZ-type rearrangements to dilatational processes(termed tension transformation zones(TTZs)).
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收藏
页码：200 / 204
页数：5
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