An analysis method for nucleation and growth controlled reactions at constant heating rate


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).

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Description/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, ηi 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.

Item Type: Article
ISSNs: 0040-6031 (print)
Related URLs:
Keywords: Al---Si alloys, differential scanning calorimetry (DSC), johnson-mehl-avrami-kolmogorov (JMAK) model, non-isothermal analysis, nucleation and growth
Subjects: T Technology
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 21703
Date Deposited: 14 Dec 2006
Last Modified: 27 Mar 2014 18:11
Contact Email Address: M.J.Starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/21703

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