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

Materials

Joan Torrens-Serra³  Shankar Venkataraman¹  Mihai Stoica¹  Uta Kuehn¹  Stefan Roth² 

[1] IFW-Dresden, Institut für Komplexe Materialien, Helmholtzstraβe 20, Dresden D-01069, Germany; E-Mails:;IFW-Dresden, Institut für Metallische Werkstoffe, Helmholtzstraβe 20, Dresden D-01069, Germany; E-Mail:;Departament de Física, Universitat de les Illes Balears, Cra. De Valldemossa km 7.5, Palma de Mallorca 07122, Spain

关键词: metallic glasses;    crystallization kinetics;    calorimetry;   

DOI  :  10.3390/ma4122231

来源: mdpi

【 摘 要 】

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 Cu₄₇Ti₃₃Zr₁₁Ni₈Si₁ 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 Fe₇₇Nb₇B₁₅Cu₁ 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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.