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Abstract
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.
Acknowledgements
Financial support is from the NSFC (grants nos. 10725211 and 10721202), the NSAF (grant no. 10976100), the National Basic Research Program of China (grant no. 2009CB724401) and the Key Project of Chinese Academy of Sciences (no. KJCX2-YW-M04). We are highly grateful to the anonymous reviewer for his/her helpful comments, which have improved our manuscript significantly.