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Atomic-scale relaxation dynamics and aging in a metallic glass probed by x-ray photon correlation spectroscopy
Ruta, B. (European Synchrotron Radiation Facility)
Chushkin, Y. (European Synchrotron Radiation Facility)
Monaco, G. (European Synchrotron Radiation Facility)
Cipelletti, L. (Laboratoire Charles Coulomb (Montpellier, França))
Pineda Soler, Eloi (Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear)
Bruna Escuer, Pere (Universitat Politècnica de Catalunya. Departament de Física Aplicada)
Giordano, V. M. (Université Claude Bernard Lyon 1)
González Silveira, Marta (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data: 2012
Resum: 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.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; publishedVersion
Publicat a: Physical review letters, Vol. 109, Issue 16 (October 2012) , p. 165701, ISSN 0031-9007

DOI: 10.1103/PhysRevLett.109.165701

5 p, 1.6 MB

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