title: Atomic-scale relaxation dynamics and aging in a metallic glass probed by x-ray photon correlation spectroscopy.
abstract: We use x-ray photon correlation spectroscopy to investigate the structural relaxation process in a metallic glass on the atomic length scale. We report evidence for a dynamical crossover between the supercooled liquid phase and the metastable glassy state, suggesting different origins of the relaxation process across the transition. Furthermore, using different cooling rates, we observe a complex hierarchy of dynamic processes characterized by distinct aging regimes. Strong analogies with the aging dynamics of soft glassy materials, such as gels and concentrated colloidal suspensions, point at stress relaxation as a universal mechanism driving the relaxation dynamics of out-of-equilibrium systems.
authors.affiliation: European Synchrotron Radiation Facility, BP220, F-38043 Grenoble, France. ruta@esrf.fr
authors.forename: B
authors.initials: B
authors.lastname: Ruta
authors.forename: Y
authors.initials: Y
authors.lastname: Chushkin
authors.forename: G
authors.initials: G
authors.lastname: Monaco
authors.forename: L
authors.initials: L
authors.lastname: Cipelletti
authors.forename: E
authors.initials: E
authors.lastname: Pineda
authors.forename: P
authors.initials: P
authors.lastname: Bruna
authors.forename: V M
authors.initials: VM
authors.lastname: Giordano
authors.forename: M
authors.initials: M
authors.lastname: Gonzalez-Silveira