Numerical method of non-isothermal curve analysis by means of electrical resistance measurement during cooling |
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Authors: | J. Holender J. Sołtys R. Kozubski |
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Affiliation: | 1. Institute of Physics, Jagellonian University, Reymonta 4, 30-059, Cracow, Poland
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Abstract: | The temperature-dependence of the electrical resistance of Al-Zn 78 wt.% was measured during linear cooling of the samples in the range of eutectoidal decomposition. The resulting resistancevs. temperature curves were analysed by: deriving the temperature-dependence of the volume fractionx(T) of theη precipitate; fitting the theoretical functionx(T)=x h (T)+x c (T) following from numerical integration of the reaction rate equations for the simultaneously occurring homogeneous (H) and cellular (C) precipitation processes. As a result, the activation energiesE h andE c , the JMA exponentsn h andn c , the rate constantsk h andk c , and the critical temperaturesT o of the two processes were estimated. |
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