Direct atomic-scale evidence for shear-dilatation correlation in metallic glasses

YJ Wang and MQ Jiang and ZL Tian and LH Dai, SCRIPTA MATERIALIA, 112, 37-41 (2016).

DOI: 10.1016/j.scriptamat.2015.09.005

Direct atomic-scale evidence is presented for the shear-dilatation correlation in metallic glasses via molecular dynamics and first- principles calculations. A quantitative parabolic relationship is established between the atomic local shear and hydrostatic volumetric strains by carrying out statistical analysis on a deformed glass model. The correction is further verified by density functional theory. Our atomistic demonstration of shear-dilatation correlation collaborates with the experimentally observed a few percent volume change in shear bands. It brings quantitative insights into the unique correlation between shear transformation and cavitation in metallic glasses. (C) 2015 Elsevier Ltd. All rights reserved.

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