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).
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.
|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
|Date Deposited:||08 Sep 2006|
|Last Modified:||28 Jun 2012 10:36|
|Contributors:||Starink, M.J. (Author)
Zahra, A.-M. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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