Localized heating and fracture criterion for bulk metallic glasses

被引:98
作者
Yang, B
Liu, CT
Nieh, TG
Morrison, ML
Liaw, PK
Buchanan, RA
机构
[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA
[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
关键词
D O I
10.1557/JMR.2006.0124
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, we demonstrated that the failure of bulk metallic glasses (BMGs) results from a sudden temperature rise within a shear band. Using a shear transformation zone model, we successfully calculated the temperature within a shear band and found it consistent with the observation from an in situ infrared thermographic system. The instantaneous temperature within a shear band at fracture agrees remarkably well with the glass transition temperature (T-g), providing a new criterion to determine the strength of BMGs from their T-g. This agreement also discloses the fact that catastrophic failure of BMG is caused by the sudden drop in viscosity inside the shear band when the instantaneous temperature within a shear band approaches T-g.
引用
收藏
页码:915 / 922
页数:8
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