Studies of temperature-dependent behaviour and crystallization of Ni36.3Zr63.7 metallic glass determined by resistivity, thermopower and DSC

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B. SMILI, M. MAYOUFI, I. KABAN, J G.GASSER, F.GASSER

Abstract. In this paper, structural changes of amorphous NiZr2 metallic glass will be characterized by thermal electrical resistivity, absolute thermoelectric power and by DSC measurements. A very good agreement between the phase transition temperatures determined using different techniques has been determined. In this context, the study of the amorphous Ni36.3Zr63.7 confirmed the potential of this means of investigation to study the kinetics, structural and thermal behavior of amorphous alloys. The crystallization kinetics of Ni36.3Zr63.7 metallic glass have been studied under non-isothermal and isothermal conditions using electrical resistivity measurement. The activation energies of crystallization Ex, for three measurements of “resistivityʺ as a function of temperature with different heating rate (0.5, 2.5 and 5) °C/min, is determined to be 334,2 kJ/mol and 344,6 kJ/mol using the Kissinger and Ozawa equations respectively. The Johnson-Mehl-Avrami equation has also been applied to the isothermal kinetics and the Avrami exponents are in the range of 2.97-3,33 with an average value of n=3,15 indicating the growth of small particles with an increasing nucleation rate. The activation energy calculated by the Arrhenius equation in the isothermal process (335°C/ 340°C/345°C) has been found to decrease with the transformed volume fraction between 10% and 90% of volume transformed, and the average value calculated to be Ex = 378,2 kJ/mol. Structural and morphology study after thermal treatment have been identified by X-ray diffraction (XRD) and scanning electron microscope (SEM).

Keywords
Metallic Glass, Electronic Transport Properties, Phase Transitions, Activation Energy

Published online 12/10/2016, 4 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: B. SMILI, M. MAYOUFI, I. KABAN, J G.GASSER, F.GASSER, ‘Studies of temperature-dependent behaviour and crystallization of Ni36.3Zr63.7 metallic glass determined by resistivity, thermopower and DSC’, Materials Research Proceedings, Vol. 1, pp 5-8, 2016
DOI: http://dx.doi.org/10.21741/9781945291197-2

The article was published as article 2 of the book Dielectric Materials and Applications

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