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Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations / F. Liu in Acta materialia, Vol. 58 N° 19 (Novembre 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6542–6553 Titre : Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations : Calorimetric analysis of the crystallization of amorphous Zr50Al10Ni40 Type de document : texte imprimé Auteurs : F. Liu, Auteur ; H. Nitsche, Auteur ; F. Sommer, Auteur Année de publication : 2011 Article en page(s) : pp. 6542–6553 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nucleation  Growth  Impingement  Crystallization  kinetics Résumé : The crystallization kinetics of amorphous Zr50Al10Ni40, as measured by means of both isothermal and isochronal differential scanning calorimetry, were evaluated using a new procedure involving application of a modular analytical model to provide a complete description of the phase-transformation kinetics, in combination with a preceding analysis of the transformation-rate maximum. The power of detailed analysis of the position of the transformation-rate maximum, as a function of the transformed fraction, was demonstrated by identification of the operating impingement mode. On this basis, the kinetic parameters governing the crystallization kinetics could then be determined quantitatively using the modular analytical model. The crystallization governing mechanisms could be varied by appropriate control of the crystallization conditions. The results obtained are consistent with the microstructural evolution, as observed by transmission electron microscopy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005331 [article] Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations : Calorimetric analysis of the crystallization of amorphous Zr50Al10Ni40 [texte imprimé] / F. Liu, Auteur ; H. Nitsche, Auteur ; F. Sommer, Auteur . - 2011 . - pp. 6542–6553. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6542–6553 Mots-clés : Nucleation  Growth  Impingement  Crystallization  kinetics Résumé : The crystallization kinetics of amorphous Zr50Al10Ni40, as measured by means of both isothermal and isochronal differential scanning calorimetry, were evaluated using a new procedure involving application of a modular analytical model to provide a complete description of the phase-transformation kinetics, in combination with a preceding analysis of the transformation-rate maximum. The power of detailed analysis of the position of the transformation-rate maximum, as a function of the transformed fraction, was demonstrated by identification of the operating impingement mode. On this basis, the kinetic parameters governing the crystallization kinetics could then be determined quantitatively using the modular analytical model. The crystallization governing mechanisms could be varied by appropriate control of the crystallization conditions. The results obtained are consistent with the microstructural evolution, as observed by transmission electron microscopy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005331