Nucleation, growth and impingement modes deduced from isothermally and isochronally conducted phase transformations: Calorimetric analysis of the crystallization of amorphous Zr50Al10Ni40

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 kin...

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Bibliographic Details
Published in:Acta materialia 2010-11, Vol.58 (19), p.6542-6553
Main Authors: Liu, F., Nitsche, H., Sommer, F., Mittemeijer, E.J.
Format: Article
Language:English
Subjects:
Crystallization
Crystallization kinetics
Differential scanning calorimetry
Evolution
Growth
Impingement
Mathematical analysis
Mathematical models
Modular
Nucleation
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Summary: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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2010.08.019