Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature
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Wang-2013-Densification and strain.pdf
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Author(s)
Wang, Z. T.
Pan, J.
Li, Y.
Schuh, Christopher A.
Date Issued
September 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Wang, Z. T., J. Pan, Y. Li, and C. A. Schuh. “Densification and Strain Hardening of a Metallic Glass under Tension at Room Temperature.” Physical Review Letters 111, no. 13 (September 2013). © 2013 American Physical Society
Version
Final published version
Abstract
The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process runs away in a localized mode. Here we demonstrate conditions where the opposite, unexpected, situation occurs: the densifying process dominates, resulting in stable plastic deformation and work hardening at room temperature. We report densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry. The effect is driven by stress-enhanced diffusional relaxation, and is attended by a reduction in exothermic heat and hardening signatures similar to those observed in the classical thermal relaxation of glasses. The result is significant, stable, plastic, extensional flow in metallic glasses, which suggest a possibility of designing tough glasses based on their flow properties.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.135504
