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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
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
0040-6031
159-168
Starink, M.J.
14ee8acd-2e6d-4308-a97c-b7c04b27fe40
Zahra, A.-M.
602ec757-47a9-47dc-9739-1ba7a0e0d3db
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), 159-168. (doi:10.1016/S0040-6031(96)03135-8).

Record type: Article

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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More information

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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Contributors

Author: M.J. Starink
Author: A.-M. Zahra

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