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Volume and Enthalpy Relaxation in Bulk Metallic Glasses

Published online by Cambridge University Press:  01 February 2011

Osami Haruyama
Osami Haruyama*
Affiliation:
[email protected], Tokyo University of Science, Physics, 2641 Yamazaki, Noda, 278-8510, Japan, +81-4-7124-1501, +81-4-7123-9361
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Abstract

Volume and enthalpy relaxation processes in a sub-Tg region were investigated by density and enthalpy experiments for bulk Pd-P based and Zr-based metallic glasses. Most of glasses except for a Pd40Ni40P20 glass exhibited a single relaxation process for both volume and enthalpy relaxations and the relaxation process was well described by a stretched exponential relaxation function, Φ(t)=exp{-(t/τ)β}, with a Kohlrausch index β less than 1. The as-quenched sample was pre-annealed in a supercooled liquid region to homogenize the density fluctuation quenched in an as-quenched state. Then the retardation of onset time of relaxation appeared in case of volume relaxation. The proportionality between enthalpy change ΔH and volume change Δv during relaxation was good for Pd42.5Cu30Ni7.5P20 glass within experimental error.

Keywords

metalamorphousdifferential thermal analysis (DTA)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1048: Symposium Z – Bulk Metallic Glasses–2007 , 2007 , 1048-Z02-03
Copyright
Copyright © Materials Research Society 2008

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