Thermodynamic properties and crystallization kinetics of the Co90Sc10 amorphous alloy. (May 2018)

• Record Type: Journal Article
• Authors: Fang, Yini; Peng, Guo; Ghafari, Mohammad; Feng, Tao
• Is Part Of: Intermetallics. Volume 96(2018:May)
• Page Start: 58
• Page End: 62
• Publication Date: 2018-05
• Subjects: Amorphous alloy -- Cobalt based alloy -- Thermodynamic properties -- Crystallization kinetics -- Soft magnetic materials; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2018.02.013
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The thermodynamic properties and crystallization kinetics of the Co90 Sc10 amorphous alloy prepared by rapid quench technique were investigated by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), and simultaneous thermal analyzer (STA). In the isochronal heating process, the activation energy of crystallization is 388 kJ/mol, which was calculated by Kissinger method. The Johnson-Mehl-Avrami (JMA) model was used to describe the isothermal transformation kinetics. The variation of the activation energy of the isothermal process indicated that tiny Co particles precipitate out in the supercooled liquid region and become the nuclei of crystallization that reduce the activation energy at the beginning of crystallization process. Comprehensive results show that a-Co90 Sc10 is a promising soft magnetic material for various applications. Highlights: Thermodynamic properties and crystallization kinetics of the Co90 Sc10 amorphous alloy are reported. The thermal stability of a-Co90 Sc10 is relatively good compared with Co-based amorphous alloys. The activation energy of the isothermal process varies during the crystallization process. Crystallized Co particles formed below the crystallization temperature.