Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 744, Issue -, Pages 316-323Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.12.004
Keywords
Bulk metallic glasses; Plasticity; Fragility; Fragile-to-strong transition
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Funding
- National Key Basic Research Program, China [2016YFB0300502]
- National Natural Science Foundation of China, China [51571016, 51531001]
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Nowadays, plasticizing has become a critical issue for the engineering application of bulk metallic glasses (BMGs). What is the origin of plastic flow and how to evaluate the plasticity of BMGs with a unified standard are still open questions. Here we report a universal fragility criterion to scale the plasticity of BMGs from the equilibrium liquids and supercooled liquids. Based on our experimentally measured and previously reported viscosities at superheated and supercooled region for 51 glasses, the plasticity (epsilon) of BMGs has been found to positively correlate to the supercooling liquid fragility (m) with the equation of epsilon = 92exp[ - 73/(m-15)], where e is the plastic strain and m the fragility near glass transition temperature, but negatively correlate to the fragile-to-strong (F-S) transition tendency characterized by F-S transition factor and temperature. The intrinsic mechanism of the plasticity can be well interpreted in the frame of structural relaxation theory. This work provides a new insight into the microscopic essence of the plasticity of glassy solids and a universal approach to scale the fluidity of metallic glasses.
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