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Failure of Kissinger(-like) methods for determination of the activation energy of phase transformations in the vicinity of the equilibrium phase-transformation temperature.
- Source :
-
Journal of Materials Science . Nov2010, Vol. 45 Issue 22, p6075-6082. 8p. 2 Charts, 5 Graphs. - Publication Year :
- 2010
-
Abstract
- The activation energies of heterogeneous equilibrium phase transformations have been frequently determined by Kissinger(-like) analysis. This work demonstrates that the applicability of Kissinger(-like) method(s) to determine activation energies of heterogeneous phase transformations is justified if the phase transformation occurs far away from the equilibrium phase-transformation temperature but not if the phase transformation is investigated in the vicinity of the equilibrium phase-transformation temperature. Experimental results on the kinetics of the order-disorder transformation in NiSn, obtained both near the equilibrium phase-transformation temperature and considerably below it (using quenched samples), expose the non-validity and confirm the validity, respectively, of activation-energy values obtained by Kissinger(-like) analyses applied in the corresponding temperature ranges. Application of the Kissinger(-like) analysis in a temperature range close to the equilibrium phase-transformation temperature leads to erroneous, abnormally high values for the activation energy. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHASE transitions
*TEMPERATURE
*PHASE equilibrium
*EQUILIBRIUM
*THERMAL properties
Subjects
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 45
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 53840347
- Full Text :
- https://doi.org/10.1007/s10853-010-4693-z