Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 677, Issue -, Pages 349-355Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.09.054
Keywords
Metallic glass; Nanoindentation; Shear transformation zone; Plasticity
Categories
Funding
- National Natural Science Foundation of China [51171141, 51271141, 51471131]
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To clarify the real size of shear transformation zone (STZ) and its correlation with the plasticity of metallic glass, STZ sizes of a Zr-based bulk metallic glass (BMG) in three different structural states (as-cast, annealed and confining annealed) were examined using both rate-change and statistical methods upon nanoindentation. STZ sizes (less than 24 atoms) obtained by the statistical method approached the real STZ size of very few atoms, and showed no correlation with BMG plasticity. In sharp contrast, STZ sizes (hundreds of atoms) obtained by the rate-change method not only were much larger than the real STZ size but also exhibited a positive correlation with BMG plasticity. These discrepancies were discussed in terms of the structural evolution of BMGs upon nanoindentation. (C) 2016 Elsevier B.V. All rights reserved.
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