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

By M.J. Starink and A.-M. Zahra

Abstract

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

Topics: TN, QC
Year: 1997
OAI identifier: oai:eprints.soton.ac.uk:41448
Provided by: e-Prints Soton

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Citations

  1. (1996). Forum 217-222,
  2. (1975). The Theory of Transformation

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