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Elastic properties and atomic bonding character in metallic glasses

Abstract : The elastic properties of glasses from different metallic systems were studied in the light of the atomic packing density and bonding character. We found that the electronegativity mismatch (Δe−) between the host- and the major solute-elements provides a plausible explanation to the large variation observed for Poisson's ratio (ν) among metallic glasses (MGs) (from 0.28 for Fe-based to 0.43 for Pd-based MGs), notwithstanding a similar atomic packing efficiency (Cg). Besides, it is found that ductile MGs correspond to Δe− smaller than 0.5 and to a relatively steep atomic potential well. Ductility is, thus, favored in MGs exhibiting a weak bond directionality on average and opposing a strong resistance to volume change.
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Tanguy Rouxel, Y. Yokoyama. Elastic properties and atomic bonding character in metallic glasses. Journal of Applied Physics, American Institute of Physics, 2015, 118 (4), pp.44901 - 44901. ⟨10.1063/1.4926882⟩. ⟨hal-01385067⟩

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