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The Thermal Shear-Transformation-Zone Theory: Homogeneous Flow and Superplasticity in Bulk Metallic Glasses

Published online by Cambridge University Press:  01 February 2011

Michael L. Falk ,
James S. Langer  and
Leonid Pechenik
Michael L. Falk
Affiliation:
Department of Materials Science and Engineering, University of Michigan Ann Arbor, MI 48109–2136, U.S.A.
James S. Langer
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 98106, U.S.A.
Leonid Pechenik
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 98106, U.S.A.
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Abstract

We present an extended version of our earlier shear-transformation-zone theory of amorphous plasticity that takes into account thermally assisted molecular rearrangements. As in the previous low-temperature theory a transition is predicted between jammed and flowing states at a well defined yield stress. In the new theory the jammed state below the yield stress exhibits thermally assisted creep. The theory accounts for the experimentally observed strain-rate dependence of the viscosity of a bulk metallic glass. In particular it models the onset of superplastic behavior at high strain rates as the system approaches the yield stress. The theory also captures many of the details of the transient stress-strrain response of the metallic glass at temperatures near the glass transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM6.5
Copyright
Copyright © Materials Research Society 2004

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References

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