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Determination of the transformation exponent s from experiments at constant heating rate

Starink, M.J. and Zahra, A.-M. (1997) Determination of the transformation exponent s from experiments at constant heating rate Thermochimica Acta, 298, (1-2), pp. 179-189. (doi:10.1016/S0040-6031(97)00118-4).

Record type: Article


The transformation exponent s is a characteristic of the mechanism of a reaction and contains information on nucleation rate and type of growth; it corresponds to the Avrami parameter n in isothermal experiments. Two methods for the determination of s from experiments performed at constant heating rate are presented. They consist of plotting either the logarithm of the reaction rate or of the amount transformed versus 1/T, and s can subsequently be calculated from the slope of the initial straight line. The methods are successfully applied to precipitation in Al-6at%Si, GPB-zone formation in Al-Cu-Mg based alloys, and recrystallisation of deformed FCC metals.

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Published date: 1997
Keywords: avrami parameter, GPB zone, johnson-mehl-avrami-kolmogorov (JMAK) kinetics, linear heating, transformation exponent, precipitation, kinetics, calorimetry, activation energy, nucleation


Local EPrints ID: 41448
ISSN: 0040-6031
PURE UUID: 3f151ff8-15b8-42a5-9909-a1b6ba4e82c5

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Date deposited: 08 Sep 2006
Last modified: 17 Jul 2017 15:30

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

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