Kinetics of phase transformations in Cu-Al and Cu-Zn-Al alloys |
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Authors: | J Kwarciak |
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Institution: | (1) Institute of Physics and Chemistry of Metals, 12 Bankowa, 40-007 Katowice, Poland |
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Abstract: | The non-isothermal kinetics of the solid-state reactions taking place in Cu-Al and Cu-Zn-Al alloys were studied by DTA and X-ray measurements. It was found that the degree of conversion, which represents the change in the reacting system, is a function of the area increase in the DTA peak. The kinetic analysis shows that DTA is a useful method for the study of formal kinetic laws. From thef( ) functions, conclusions on the mechanism of the phase transformations can be drawn.
Zusammenfassung Die nicht-isotherme Kinetik von in Cu-Al und Cu-Zn-Al-Legierungen verlaufenden Festkörperreaktionen wurden mittels DTA und Röntgenmessungen untersucht. Es wurde festgestellt, daß die Zunahme der Fläche des DTA-Peaks abhängig von dem die Veränderungen im Reaktionssystem repräsentierenden Konversionsgrad ist. Die kinetische Analyse zeigt, daß die DTA eine nützliche Methode zur Untersuchung der formalen kinetischen Gesetzmäßigkeiten ist. Aus den Functionenf( ) können Schlußfolgerungen hinsichtlich des Mechanismus der Phasenübergänge gezogen werden.
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