Abstract
Isothermal relaxation behavior just under glass transition region was investigated for bulk Pd 40Ni 40P 20 and Pd 42.5Cu 30Ni 7.5P 20 metallic glasses. The densification of the bulk sample during relaxation was examined directly by density measurement using conventional Archimedean technique. The density of as-quenched Pd 40Ni 40P 20 increased monotonously with time. From the density data of Pd 40Ni 40P 20 glass, the free volume relaxation was examined and the kinetics was well described by a stretched exponential function with Kohlrausch exponent less than unity. These glasses also showed a clear two-step relaxation that may be a feature peculiar to bulk metallic glasses.
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