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.

http://dx.doi.org/10.1016/j.scriptamat.2015.09.005

The authors acknowledge the financial support from the NSFC (nos. 11402269, 11372315, 11472287, 11132011), the National Key Basic Research Program of China (no. 2012CB937500), and the CAS/SAFEA International Partnership Program for Creative Research Teams.

Wang YJ,Jiang MQ,Tian ZL,et al. Direct atomic-scale evidence for shear-dilatation correlation in metallic glasses[J]. SCRIPTA MATERIALIA,2016,112:37-41.