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Localized heating and fracture criterion for bulk metallic glasses

Published online by Cambridge University Press:  01 April 2006

B. Yang ,
C.T. Liu ,
T.G. Nieh ,
M.L. Morrison ,
P.K. Liaw  and
R.A. Buchanan
B. Yang
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
C.T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
T.G. Nieh*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996
M.L. Morrison
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
P.K. Liaw
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
R.A. Buchanan
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
*
a) Address all correspondence to this author. e-mail: tnieh@utk.edu
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Abstract

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 (Tg providing a new criterion to determine the strength of BMGs from their Tg. 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 Tg.

Keywords

AlloyAmorphousStrength
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 4 , April 2006 , pp. 915 - 922
Copyright
Copyright © Materials Research Society 2006

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