Journal
ACTA MATERIALIA
Volume 57, Issue 20, Pages 6146-6155Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.08.040
Keywords
Intermittent avalanche; Self-organized critical behavior; Plastic deformation; Bulk metallic glasses
Funding
- Research Committee of Hong Kong Polytechnic University [G-YX90]
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Under stress, bulk metallic glasses irreversibly deform through shear banding processes that manifest as serrated flow behavior. These serration events exhibit a shock-and-aftershock, earthquake-like behavior. Statistical analysis shows that the shear avalanches can self-organize to a critical state (SOC). In analogy to the smooth macroscopic-scale crystalline plasticity that arises from the spatio-temporal averages of disruptive earthquake-like events at the nanometer scale, shear avalanches in glassy metals are another model system that can be used to study SOC behavior. With our understanding of SOC behavior, we further demonstrate how to enhance the plasticity of glassy (brittle) materials. It is expected that the findings can be extended to other glassy or brittle materials. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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