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

Author(s):
Jonathan B. Puthoff, Donald S. Stone, Hongbo Cao, Paul M. Voyles

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 Ĺ3. 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 Ĺ3. We interpret the change in V* as arising from an increase in the number of atoms involved in the STZ.

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Track ID:
Paper #: 1048-Z03-08
DOI: