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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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.
|Keywords:||Al---Si alloys, differential scanning calorimetry (DSC), johnson-mehl-avrami-kolmogorov (JMAK) model, non-isothermal analysis, nucleation and growth|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||14 Dec 2006|
|Last Modified:||27 Mar 2014 18:11|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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