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Experimental analysis of non-isothermal transformations involving nucleation and growth

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Abstract

A critical examination is made of a recently suggested experimental technique which utilizes the Johnson-Mehl-Avrami transformation rate equation to describe nonisothermal transformations. It is shown that for transformations involving nucleation and growth the technique has limited applicability.

Résumé

On examine d'une manière critique une technique expérimentale récemment proposée qui utilise l'équation des vitesses de transformation proposée par Johnson-Mehl-Avrami pour décrire les transformations non-isothermes. On montre que la technique n'a qu'une applicabilité limitée pour les transformations qui s'effectuent par nucléation et croissance.

Zusammenfassung

Eine kritische Prüfung der neulich vorgeschlagenen Versuchstechnik, welche die Johnson-Mehl-Avrami Transformations-Geschwindigkeitsgleichung zur Beschreibung nichtisothermer Umwandlungen einsetzt, wird vorgenommen. Es wird gezeigt, daß die Methode für Umwandlungen mit Kernbildung und Wachstum nur eine geringe Einsatzfähigkeit besitzt.

Резюме

Проведено критическ ое исследование неда вно предложенного экспе риментального метода, в котором для о писания неизотермич еских превращений использ уется уравнение скорости превращени я Джонсона-Мехл-Аврам и. Показано, что этот метод имеет ограниченное примен ение для превращений, включающих образование центров кристаллизации и их роста.

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Additional information

The author wishes to thank Professor D. G. Ast and Professor E. J. Kramer for their advice, and stimulating discussions.

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Henderson, D.W. Experimental analysis of non-isothermal transformations involving nucleation and growth. Journal of Thermal Analysis 15, 325–331 (1979). https://doi.org/10.1007/BF01903656

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  • DOI: https://doi.org/10.1007/BF01903656

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