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Non-isothermal crystallization kinetics of a rapidly solidified as-cast TiZrHfNiCu high entropy bulk metallic glass

Nordin, Norhuda Hidayah and Mohamad, Faiz Syazwan and Jamal, Nur Ayuni Jamal (2020) Non-isothermal crystallization kinetics of a rapidly solidified as-cast TiZrHfNiCu high entropy bulk metallic glass. World Journal of Engineering and Technology, 8. pp. 280-295. ISSN 2331-4222 E-ISSN 2331-4249

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Abstract

This paper aims to investigate the thermal behavior and crystallization kinetics of TiZrHfNiCu high entropy bulk metallic glass (HE-BMG) alloy using the standard procedure of Differential Scanning Calorimetric (DSC) annealing technique. The alloy was produced using an arc melting machine with a critical diameter of 1.5 mm. The crystallization kinetics and phase transformation mechanism of TiZrHfNiCu HE-BMG was investigated under the isochronal condition at a single heating run based on the Johnson-Mehl- Avrami (JMA) theory. In isochronal heating, the apparent activation energy for glass transition and crystallization events was analyzed by Kissinger and Ozawa methods. The average activation energy value for crystallization of TiZrHfNiCu amorphous alloys in isochronal modes was 226.41 kJ/mol for the first crystallization and 297.72 kJ/mol for second crystallization stages. The crystallization mechanism of the first step was dominated by two- and three-dimensional growth with increasing nucleation rate, while the crystallization mechanism in the second stage was dominated by two-dimensional crystallization growth with a constant nucleation rate. The diffusion mechanism result proved the theory of sluggish atomic diffusion of HEA at elevated temperature.

Item Type: Article (Journal)
Uncontrolled Keywords: Crystallization Kinetics, High Entropy Bulk Metallic Glass, Phase Transformation, Sluggish Diffusion
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TA Engineering (General). Civil engineering (General) > TA174 Engineering design
T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
T Technology > TA Engineering (General). Civil engineering (General) > TA630 Structural engineering (General)
T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User: DR NORHUDA HIDAYAH NORDIN
Date Deposited: 19 Mar 2021 09:33
Last Modified: 19 Mar 2021 09:33
URI: http://irep.iium.edu.my/id/eprint/88633

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