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Local temperature rises during mechanical testing of metallic glasses

Published online by Cambridge University Press:  03 March 2011

Y. Zhang ,
N.A. Stelmashenko ,
Z.H. Barber ,
W.H. Wang ,
J.J. Lewandowski  and
A.L. Greer
Y. Zhang
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
N.A. Stelmashenko
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
Z.H. Barber
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
W.H. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, People’s Republic of China
J.J. Lewandowski
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
A.L. Greer*
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom
*
b) Address all correspondence to this author. e-mail: alg13@cam.ac.uk
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Abstract

Under ambient conditions, plastic flow in metallic glasses is sharply localized into shear bands. The heat content of, and consequent temperature rise at, shear bands in three bulk metallic glasses are compared using a recently reported fusible coating method. The minimum shear offsets necessary to detect local heating are determined. It is shown that the dependence of heat content on offset is consistent with frictional heating in the band. The effective stress on the band undergoing shear is 50–70% of the macroscopic shear stress, a ratio compared with simulations of shear-band initiation and operation. It is also noted that frictional heating can occur not only at shear bands, but also at mixed-mode cracks.

Keywords

AlloyAmorphousStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 419 - 427
Copyright
Copyright © Materials Research Society 2007

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References

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