Correlation between supercooled liquid relaxation and glass Poisson's ratio

We report on a correlation between the supercooled liquid (SL) relaxation and glass Poisson's ratio (v) by comparing the activation energy ratio (r) of the alpha and the slow beta relaxations and the v values for both metallic and nonmetallic glasses. Poisson's ratio v generally increases with an increase in the ratio r and this relation can be described by the empirical function v = 0.5 - A*exp(-B * r), where Lambda and B are constants. This correlation might imply that glass plasticity is associated with the competition between the alpha and the slow beta relaxations in SLs. The underlying physics of this correlation lies in the heredity of the structural heterogeneity from liquid to glass. This work gives insights into both the microscopic mechanism of glass deformation through the SL dynamics and the complex structural evolution during liquid-glass transition. (C) 2015 AIP Publishing LLC.