Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 90, Issue 4, Pages 269-277Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500831003630781
Keywords
plasticity; metallic glass; short-range-order; elastic modulus
Categories
Funding
- NSFC [10725211, 10721202]
- NSAF [10976100]
- National Basic Research Program of China [2009CB724401]
- Key Project of Chinese Academy of Sciences [KJCX2-YW-M04]
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Through a systematical analysis of the elastic moduli for 137 metallic glasses (MGs) and 56 polycrystalline metals, we use a simple model developed by Knuyt et al. [J. Phys. F: Met. Phys. 16 (1986) p. 1989; Phil. Mag. B 64 (1991) p. 299] based on a Gaussian distribution for the first-neighbor distance to reveal the short-range-order (SRO) structural conditions for plasticity of MGs. It is found that the SRO structure with dense atomic packing, large packing dispersion and a significant anharmonicity of atomic interaction within an MG is favorable for its global plasticity. Although these conditions seem paradoxical, their perfect matching is believed to be a key for designing large plastic bulk MGs not only in compression but also in tension.
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