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Thermal stability, crystallization kinetics, and grain growth in an amorphous Al85Ce5Ni8Co2 alloy

Published online by Cambridge University Press:  31 January 2011

Á. Révész
Affiliation:
Department of Physics, Faculty of Sciences, Universitat Autònoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain, and Department of General Physics, Eötvös University, H-1518 Budapest, P.O.B. 32, Hungary
L. K. Varga
Affiliation:
Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary
S. Suriñach
Affiliation:
Department of Physics, Faculty of Sciences, Universitat Autònoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
M. D. Baró
Affiliation:
Department of Physics, Faculty of Sciences, Universitat Autònoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
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Abstract

Thermal stability and crystallization kinetics of the melt-quenched amorphous Al85Ce5Ni8Co2 alloy were investigated by x-ray diffraction and differential scanning calorimetry (DSC). The glass transition was followed by a supercooled liquid region (21 °C) and then by a two-step crystallization process. The final microstructure contained Al3Ce, α–Al, Al3Ni, and Al9Co2 phases. Isothermal annealing of the as-quenched samples in the range of 275–285 °C showed that both crystallization reactions occurred through a nucleation and growth process. Continuous heating DSC measurements following pre-anneals for different times were also carried out to study the crystallization kinetics and the stability of the material. The Avrami analysis of the isothermal DSC-curves revealed that the 3-dimensional nucleation and growth process became more dominant with increasing annealing temperature. The average specific grain boundary energy corresponded to high-angle grain boundaries and indicated independent nucleation events.

Type
Articles
Copyright
Copyright © Materials Research Society 2002

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