Mechanical glass transition revealed by the fracture toughness of metallic glasses.

ABSTRACT: The fracture toughness of glassy materials remains poorly understood. In large part, this is due to the disordered, intrinsically non-equilibrium nature of the glass structure, which challenges its theoretical description and experimental determination. We show that the notch fracture toughness of metallic glasses exhibits an abrupt toughening transition as a function of a well-controlled fictive temperature (Tf), which characterizes the average glass structure. The ordinary temperature, which has been previously associated with a ductile-to-brittle transition, is shown to play a secondary role. The observed transition is interpreted to result from a competition between the Tf-dependent plastic relaxation rate and an applied strain rate. Consequently, a similar toughening transition as a f

SUBMITTER: Ketkaew J 

PROVIDER: S-EPMC6095891 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature