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

doi:https://doi.org/10.1557/JMR.2002.0315

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

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

21 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 language	English
Pages (from-to)	2140-2146
Journal	Journal of Materials Research
Volume	17
DOIs	https://doi.org/10.1557/JMR.2002.0315
Publication status	Published - 1 Jan 2002

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

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.",

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AU - Révész, A.

AU - Varga, L. K.

AU - Suriñach, S.

AU - Baró, M. D.

PY - 2002/1/1

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N2 - 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.

AB - 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.

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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

Abstract

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