Non-Isothermal Kinetic Analysis of the Crystallization of Metallic Glasses Using the Master Curve Method

The non-isothermal transformation rate curves of metallic glasses are analyzed with the Master Curve method grounded in the Kolmogorov-Johnson-Mehl-Avrami theory. The method is applied to the study of two different metallic glasses determining the activation energy of the transformation and the expe...

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Detalles Bibliográficos
Autores principales: Torrens-Serra, Joan, Venkataraman, Shankar, Stoica, Mihai, Kuehn, Uta, Roth, Stefan, Eckert, Jürgen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2011
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448886/
https://www.ncbi.nlm.nih.gov/pubmed/28824135
http://dx.doi.org/10.3390/ma4122231
Descripción
Sumario:The non-isothermal transformation rate curves of metallic glasses are analyzed with the Master Curve method grounded in the Kolmogorov-Johnson-Mehl-Avrami theory. The method is applied to the study of two different metallic glasses determining the activation energy of the transformation and the experimental kinetic function that is analyzed using Avrami kinetics. The analysis of the crystallization of Cu(47)Ti(33)Zr(11)Ni(8)Si(1) metallic glassy powders gives E(a) = 3.8 eV, in good agreement with the calculation by other methods, and a transformation initiated by an accelerating nucleation and diffusion-controlled growth. The other studied alloy is a Nanoperm-type Fe(77)Nb(7)B(15)Cu(1) metallic glass with a primary crystallization of bcc-Fe. An activation energy of E(a) = 5.7 eV is obtained from the Master Curve analysis. It is shown that the use of Avrami kinetics is not able to explain the crystallization mechanisms in this alloy giving an Avrami exponent of n = 1.

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