An analysis method for nucleation and growth controlled reactions at constant heating rate
An analysis method for nucleation and growth controlled reactions at constant heating rate
A quantitative model is derived for the progress of a nucleation and growth controlled reaction during heating at a constant rate. It incorporates nucleation, growth, and impingement, takes account of temperature dependent solubility, and distinguishes between diffusion controlled growth and linear growth. Parameters of the model for a single process reaction are: s, which is akin to the Avrami parameter for isothermal analysis, Eeff the effective activation energy, ?i the impingement parameter, and a pre-exponential constant. The model is applied to the DSC data on precipitation in Al---Si alloys. An excellent agreement between data and model is obtained. The parameter s is interpreted in terms of the processes taking place, namely growth of small nuclei, growth of coarse particles or nucleation and growth.
Al---Si alloys, differential scanning calorimetry (DSC), johnson-mehl-avrami-kolmogorov (JMAK) model, non-isothermal analysis, nucleation and growth
159-168
Starink, M.J.
14ee8acd-2e6d-4308-a97c-b7c04b27fe40
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
1997
Starink, M.J.
14ee8acd-2e6d-4308-a97c-b7c04b27fe40
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
Starink, M.J. and Zahra, A.-M.
(1997)
An analysis method for nucleation and growth controlled reactions at constant heating rate.
Thermochimica Acta, 292 (1-2), .
(doi:10.1016/S0040-6031(96)03135-8).
Abstract
A quantitative model is derived for the progress of a nucleation and growth controlled reaction during heating at a constant rate. It incorporates nucleation, growth, and impingement, takes account of temperature dependent solubility, and distinguishes between diffusion controlled growth and linear growth. Parameters of the model for a single process reaction are: s, which is akin to the Avrami parameter for isothermal analysis, Eeff the effective activation energy, ?i the impingement parameter, and a pre-exponential constant. The model is applied to the DSC data on precipitation in Al---Si alloys. An excellent agreement between data and model is obtained. The parameter s is interpreted in terms of the processes taking place, namely growth of small nuclei, growth of coarse particles or nucleation and growth.
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Published date: 1997
Keywords:
Al---Si alloys, differential scanning calorimetry (DSC), johnson-mehl-avrami-kolmogorov (JMAK) model, non-isothermal analysis, nucleation and growth
Identifiers
Local EPrints ID: 21703
URI: http://eprints.soton.ac.uk/id/eprint/21703
ISSN: 0040-6031
PURE UUID: 9160d099-bf1c-4425-951c-d9d21c53379f
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Date deposited: 14 Dec 2006
Last modified: 15 Mar 2024 06:32
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Author:
M.J. Starink
Author:
A.-M. Zahra
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