title: Modeling of the Sub-Tg Relaxation Spectrum of Pd42.5Ni7.5Cu30P20 Metallic Glass.
abstract: We study the mechanical relaxation spectrum of Pd42.5Ni7.5Cu30P20 metallic glass. The effect of aging on the relaxation behavior is analyzed by measuring the internal friction during consecutive heating runs. The mechanical relaxation of the well-annealed glass state is modeled by fitting susceptibility functions to the primary and secondary relaxations of the system. The model is able to reproduce the mechanical relaxation spectrum below the glass transition temperature (sub-Tg region) in the frequency-temperature ranges relevant for the high temperature physical properties and forming ability of metallic glasses. The model reveals a relaxation spectrum composed by the overlapping of primary and secondary processes covering a wide domain of times but with a relatively narrow range of activation energies.
authors.affiliation: Departament de Física, Universitat Politècnica de Catalunya - BarcelonaTech, EETAC , Esteve Terradas 5, 08860 Castelldefels, Spain.
authors.forename: Chaoren
authors.initials: C
authors.lastname: Liu
authors.affiliation: Departament de Física, Universitat Politècnica de Catalunya - BarcelonaTech, ESAB , Esteve Terradas 8, 08860 Castelldefels, Spain.
authors.forename: Eloi
authors.initials: E
authors.lastname: Pineda
authors.affiliation: School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University , Xi'an 710072, P. R. China.
authors.forename: Jichao
authors.initials: J
authors.lastname: Qiao
authors.affiliation: Departament de Física, Universitat Politècnica de Catalunya - BarcelonaTech, EETAC , Esteve Terradas 5, 08860 Castelldefels, Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Crespo