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On the isothermal kinetics analysis of transformations in metastable systems. A combined use of isothermal and non-isothermal calorimetry

 

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Opened Access On the isothermal kinetics analysis of transformations in metastable systems. A combined use of isothermal and non-isothermal calorimetry
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Author: Blázquez Gámez, Javier Sebastián
Millán, Mitchel D.
Conde Amiano, Clara Francisca
Conde Amiano, Alejandro
Coordinator/Director: Conde Amiano, Alejandro
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2007
Published in: Philosophical Magazine, 87 (27), 4151 p.-4167 p..
Document type: Article
Abstract: A procedure to optimize the isothermal calorimetric data of very slow transformation processes of metastable systems is proposed. The method uses an experimental baseline to identify the transitory effects due to the equipment. Moreover, the combined use of isothermal and non-isothermal results is shown to be effective to overcome the intrinsic problems of low signal and signal drift for such processes. The procedure has been applied to the analysis of the nanocrystallization kinetics of the Fe60Co18Nb6B16 alloy at different devitrification stages. Based on microstructural observations, an instantaneous growth approach was assumed and a phenomenological expression of the dependence of the nucleation frequency with both the transformed fraction and the temperature was obtained
Cite: Blázquez Gámez, J., Millán, M.D., Conde Amiano, C.F. y Conde Amiano, A. (2007). On the isothermal kinetics analysis of transformations in metastable systems. A combined use of isothermal and non-isothermal calorimetry. Philosophical Magazine, 87 (27), 4151 p.-4167 p..
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URI: http://hdl.handle.net/11441/49831

DOI: 10.1080/14786430701530990

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