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Structural Relaxation and Crystallization in a Pd40Cu30Ni10P20 Bulk Metallic Glass

Published online by Cambridge University Press:  01 February 2011

R. Raghavan
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, INDIA
U. Ramamurty
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, INDIA
J. Basu
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, INDIA
S. Ranganathan
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, INDIA
N. Nishiyama
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, JAPAN
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Abstract

The stability of a Pd40Cu30Ni10P20 bulk metallic glass (BMG) against structural relaxation is investigated by isothermal and isochronal annealing heat treatments below and above its glass transition temperature, Tg, for varying periods. Differential scanning calorimetry (DSC) of the annealed samples shows an excess endotherm at Tg, irrespective of the annealing temperature. This recovery peak evolves exponentially with annealing time and is due to the destruction of anneal-induced compositional short range ordering. The alloy exhibits a high resistance to crystallization on annealing below Tg and complex Pd- and Ni-phosphides evolve on annealing above Tg.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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