Kinetic study of non-isothermal crystallization in Al80Fe10Ti5Ni5 metallic glass

• Published in: Metals and materials international 2013, 19(5), , pp.901-906
• Main Authors: Tavoosi, M., Karimzadeh, F., Enayati, M. H., Lee, S., Kim, H. S.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Solid Mechanics; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-013-5001-7

This study investigated the crystallization behavior of a kinetically metastable Al 80 Fe 10 Ti 5 Ni 5 amorphous phase. The Al 80 Fe 10 Ti 5 Ni 5 amorphous phase was synthesized via the mechanical alloying of elemental powders of Al, Fe, Ti, and Ni. The microstructures and crystallization kinetics of the as-milled and annealed powders were characterized using X-ray diffraction, transition electron microscopy, and non-isothermal differential thermal analysis techniques. The results demonstrated that an Al 80 Fe 10 Ti 5 Ni 5 amorphous phase was obtained after 40 h of ball milling. The produced amorphous phase exhibited one-stage crystallization on heating, i.e., the amorphous phase transforms into nanocrystalline Al 13 (Fe,Ni) 4 (40 nm) and Al 3 Ti (10 nm) intermetallic phases. The activation energy for the crystallization of the alloy evaluated from the Kissinger equation was approximately 538±5 kJ/mol using the peak temperature of the exothermic reaction. The Avrami exponent or reaction order n indicates that the nucleation rate decreases with time and the crystallization is governed by a three-dimensional diffusion-controlled growth. These results provide new opportunities for structure control through innovative alloy design and processing techniques.