title: Unified Criterion for Temperature-Induced and Strain-Driven Glass Transitions in Metallic Glass.
abstract: In a model metallic glass, we study the relaxation dynamics in both the linear and the nonlinear response regimes by numerical simulations of dynamical mechanical spectroscopy and analyze the atomic displacement statistics. We find that the primary (α) relaxation always takes place when the most probable atomic displacement reaches a critical fraction (~20%) of the average interatomic distance, irrespective of whether the relaxation is induced by temperature (linear response) or by mechanical strain (nonlinear response). Such a unified scenario, analogous to the well-known Lindemann criterion for crystal melting, provides insight into the structural origin of the strain-induced glass-liquid transition.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: H B
authors.initials: HB
authors.lastname: Yu
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: R
authors.initials: R
authors.lastname: Richert
authors.affiliation: Department of Materials Science and Engineering at the University of Illinois at Urbana-Champaign, Urbana, Illinois 6180, USA.
authors.forename: R
authors.initials: R
authors.lastname: Maaß
authors.affiliation: I. Physikalisches Institut, Universität Göttingen, D-37077 Göttingen, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Samwer