Kinetic Crystallization Behavior of Amorphous U60Fe27.5Al12.5 Alloy
Received date: 2021-02-25
Revised date: 2021-05-05
Online published: 2021-08-31
Supported by
Joint Funds of National Natural Science Foundation of China(U2030208);National Natural Science Foundation of China(51731002);Strengthening Fundamental Foundation Project(JCJQ-20190415);Fund of Science and Technology on Surface Physics and Chemistry Laboratory(6142A02200205)
Due to their high strength and excellent anticorrosive properties, U-based amorphous alloys are quite promising for applications in nuclear-related fields. However, they face the challenge of crystallization due to high temperatures during some applications. Currently, focus on the crystallization mechanism of such materials is limited; thus, further investigation is required. Herein, using differential scanning calorimetry, both nonisothermal and isothermal crystallization kinetics of typical amorphous U60Fe27.5Al12.5 alloy were investigated. This alloy was further analyzed using different theoretical methods. The alloy exhibited the glass transition activation energy of slightly more than 270 kJ/mol and the melt fragility value of about 22, indicating that it is a strong metallic glass material. Based on the first exothermal crystallization peak, this glassy alloy is believed to possess the crystallization activation energy of 205-275 kJ/mol within nonisothermal method and 280-390 kJ/mol within the other method. The former value is much lower than the latter, which is consistent with the results of the conventional amorphous alloys. This general trend is mainly because crystallization can be activated more easily by a continuous increase in temperature. The kinetic factor of the alloy was in the ranges of 3-4 and 2.5-3 under the nonisothermal and isothermal conditions, respectively, demonstrating that the devitrification of the noncrystalline U-Fe-Al alloy greatly depends on the nucleation process, which is prone to occur during a rise in temperature.
Luhui HAN , Haibo KE , Pei ZHANG , Ge SANG , Huogen HUANG . Kinetic Crystallization Behavior of Amorphous U60Fe27.5Al12.5 Alloy[J]. Acta Metall Sin, 2022 , 58(10) : 1316 -1324 . DOI: 10.11900/0412.1961.2021.00077
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