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Temperature increases caused by shear banding in as-cast and relaxed Zr-based bulk metallic glasses under compression

Published online by Cambridge University Press:  31 January 2011

W.H. Jiang ,
F.X. Liu ,
H.H. Liao ,
H. Choo ,
P.K. Liaw ,
B.J. Edwards  and
B. Khomami
W.H. Jiang*
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
F.X. Liu
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
H.H. Liao
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
H. Choo
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200; and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
P.K. Liaw
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
B.J. Edwards
Affiliation:
Department of Chemical and Biomolecular Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
B. Khomami
Affiliation:
Department of Chemical and Biomolecular Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
*
a)Address all correspondence to this author. e-mail: wjiang5@utk.edu
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Abstract

Using an infrared camera, the temperature evolution of as-cast and relaxed bulk metallic glasses during compression was measured. Substantial variations in the temperatures of both glasses during plastic deformation were observed, which are conjectured to result at least partially from shear-banding phenomena. The relaxed glass has a larger temperature rise than the as-cast glass, which can be attributed to a reduction in the free volume. The larger temperature increase in the relaxed glass may be responsible for the observed work softening. The relaxed glass also has a higher maximum temperature than the as-cast, which can be attributed to a stronger strain-rate dependence of the temperature rise rate, and a shorter dissipation time scale for the heat due to conduction. The experimental data follow the well-known model behavior, and suggest the possibility of a statistical correlation between the fluctuations of strain rates and the rates of the temperature variation.

Keywords

AmorphousMetal
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 2967 - 2974
Copyright
Copyright © Materials Research Society 2008

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