Study of the crystallization kinetics of a Zr57Cu15.4Ni12.6Al10Nb5 amorphous alloy

• Published in: International journal of materials research Vol. 111; no. 10; pp. 849 - 856
• Main Authors: Hu, Hui E., Lu, Zhou, Hong Su, Xiao, Xin Deng, Jing
• Format: Journal Article
• Language: English
• Published: Stuttgart De Gruyter 01.10.2020; Carl Hanser Verlag
• Subjects: Activation energy; Amorphous alloy; Amorphous alloys; Crystallization; Crystallization kinetics; Diffusion rate; Glass transition temperature; JMA model; Kinetics; Kissinger analysis; Metallic glasses; Nucleation
• ISSN: 1862-5282; 2195-8556
• DOI: 10.3139/146.111950

The non-isothermal crystallization kinetics with heating rates ranging from 10 K s to 80 K s and the isothermal crystallization kinetics during annealing from the glass transition temperature to the crystallization onset temperature of a Zr Cu Ni Al Nb amorphous alloy were studied in detail using X-ray diffraction and differential scanning calorimetry. During non-isothermal crystallization, it is more difficult to nucleate than to grow, and the crystallization resistance increases first and then decreases. During isothermal crystallization of the alloy from 713- 728 K, there are two exothermic peaks corresponding to a diffusion-controlled growth process with decreasing nucleation rate and increasing nucleation rate. From 733- 748 K, only one exothermic peak appears, and the growth process is controlled by the interface with decreasing nucleation rate. Isothermal crystallization is a process in which the crystallization resistance increases. The resistance of isothermal crystallization is less than that of non-isothermal crystallization.