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), 179-189. (doi:10.1016/S0040-6031(97)00118-4).


Download (209Kb)


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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S0040-6031(97)00118-4
ISSNs: 0040-6031 (print)
Related URLs:
Keywords: avrami parameter, GPB zone, johnson-mehl-avrami-kolmogorov (JMAK) kinetics, linear heating, transformation exponent, precipitation, kinetics, calorimetry, activation energy, nucleation
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 41448
Date :
Date Event
Date Deposited: 08 Sep 2006
Last Modified: 31 Mar 2016 12:12

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics