Thermal stability, crystallization kinetics, and grain growth in an amorphous Al<inf>85</inf>Ce<inf>5</inf>Ni<inf>8</inf>Co<inf>2</inf> alloy

A. Révész, L. K. Varga, S. Suriñach, M. D. Baró

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19 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)2140-2146
JournalJournal of Materials Research
Volume17
DOIs
Publication statusPublished - 1 Jan 2002

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