An integral fitting method for analyzing the isochronal transformation kinetics: Application to the crystallization of a Ti-based amorphous alloy

• Published in: The Journal of physics and chemistry of solids 2009-11, Vol.70 (11), p.1448-1453
• Main Authors: Wang, J., Kou, H.C., Li, J.S., Gu, X.F., Zhong, H., Chang, H., Zhou, L.
• Format: Article
• Language: English
• Subjects: A. Alloys; A. Amorphous materials; C. Differential scanning calorimetry; Cross-disciplinary physics: materials science; rheology; D. Phase transitions; Exact sciences and technology; Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Methods of crystal growth; physics of crystal growth; Physics
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2009.09.006

An integral fitting method has been developed to determine the phase transformation mechanism and to extract the kinetic parameters during the crystallization of amorphous alloys. The proper kinetic function of the phase transformation was firstly deduced. Theoretical differential scanning calorimetry curves were then calculated. All the kinetic parameters can be extracted by fitting the calculated differential scanning calorimetry curves to experimental data. We applied the integral fitting method to analyze the isochronal crystallization of the Ti 50Cu 42Ni 8 amorphous alloy. Results indicate that a transformation process considering impingement is more suitable to describe the crystallization kinetics of this alloy than using the traditional Johnson–Mehl–Avrami model. Mean values of the obtained kinetic parameters show strong heating rate dependence.