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Microstructural evolution during decomposition and crystallization of the Cu60Zr20Ti20 amorphous alloy

Published online by Cambridge University Press:  03 March 2011

A. Concustell ,
Á. Révész ,
S. Suriñach ,
L.K. Varga ,
G. Heunen  and
M.D. Baró
A. Concustell
Affiliation:
Department of Physics, Faculty of Sciences, Universitat AutòAgonoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
Á. Révész
Affiliation:
Department of Physics, Faculty of Sciences, Universitat AutòAgonoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
S. Suriñach
Affiliation:
Department of Physics, Faculty of Sciences, Universitat AutòAgonoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
L.K. Varga
Affiliation:
Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B. 49, Hungary
G. Heunen
Affiliation:
European Synchrotron Radiation Facilities (ESRF), Grenoble, France 38042
M.D. Baró*
Affiliation:
Department of Physics, Faculty of Sciences, Universitat AutòAgonoma Barcelona, Edifici Cc, 08193 Bellaterra, Barcelona, Spain
*
b)Address all correspondence to this author. e-mail: Dolors.Baro@uab.es
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Abstract

The effect of continuous heating and isothermal heat treatments on ductile Cu60Zr20Ti20 amorphous ribbons was monitored by differential scanning calorimetry, x-ray diffraction, synchrotron radiation transmission, and high-resolution transmission electron microscopy. Upon continuous heating, the alloy exhibited a glass transition, followed by a supercooled liquid region and two exothermic crystallization stages. Decomposition of the amorphous phase was also observed. The first crystallization stage resulted in the formation of a nanocomposite structure with hexagonal Cu51Zr14 particles embedded in the amorphous matrix, while in the second crystallization stage hexagonal Cu2TiZr-like phase was precipitated. The released enthalpies were 19 J/g and 30 J/g for each crystallization stage. Crystallization kinetics was studied by the classical nucleation theory. Deviations from the Johnson–Mehl–Avrami–Kolmogorov theory may be explained by the contribution of the decomposition of the amorphous matrix.

Keywords

Metallic glassNanoparticleMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 2 , February 2004 , pp. 505 - 512
Copyright
Copyright © Materials Research Society 2004

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