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Change in Activation Volume for Plastic Deformation of Zr-based Bulk Metallic Glass following Annealing

Published online by Cambridge University Press:  01 February 2011

Jonathan B. Puthoff ,
Donald S. Stone ,
Hongbo Cao  and
Paul M. Voyles
Jonathan B. Puthoff
Affiliation:
[email protected], University of Wisconsin - Madison, Materials Science Program, Department of Materials Science & Engineering, 1509 University Avenue, Madison, WI, 53706, United States, 6082621225
Donald S. Stone
Affiliation:
[email protected], University of Wisconsin - Madison, Department of Materials Science & Engineering, 1509 University Avenue, Madison, WI, 53706, United States
Hongbo Cao
Affiliation:
[email protected], University of Wisconsin - Madison, Materials Science Program, 1509 University Avenue, Madison, WI, 53706, United States
Paul M. Voyles
Affiliation:
[email protected], University of Wisconsin - Madison, Department of Materials Science & Engineering, 1509 University Avenue, Madison, WI, 53706, United States
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Abstract

We performed nanoindentation creep experiments on the bulk metallic glass Zr54Cu38Al8 in an effort to measure the scale of the individual deformation events responsible for plastic deformation. From a nanoindentation creep experiment, we can determine V*, the activation volume, which we interpret as the volume of a shear transformation zone (STZ) multiplied by the shear strain undergone by the STZ during thermal activation. For the as-cast alloy hardness, H, is 5.33 ± 0.06 GPa, and V* is 87 ± 5 Å3. The alloy was then annealed near Tg for 24 hr and retested. No crystallization occurred during annealing as verified by XRD and TEM. Following annealing H increased to 7.36 ± 0.08 GPa and V* increased to 160 ± 10 Å3. We interpret the change in V* as arising from an increase in the number of atoms involved in the STZ.

Keywords

activation analysisamorphousalloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1048: Symposium Z – Bulk Metallic Glasses–2007 , 2007 , 1048-Z03-08
Copyright
Copyright © Materials Research Society 2008

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