Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-01-15

Journal: JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals: EI、SCIE

Volume: 691

Page Number: 436-441

ISSN: 0925-8388

Key Words: Amorphous alloy; Uranium alloy; Crystallization; Percolation

Abstract: The non-isothermal crystallization behavior of uranium-based amorphous alloy U64Co28.5Al7.5 was investigated by using differential scanning calorimetry. Its kinetic fragility parameter, overall crystallization activation energy and Kauzmann temperature were determined to be 28, 234 kJ/mol and 580 K, respectively. The evolution of the crystallization activation energy with the volume fraction crystallized, which was established by both the Kissinger and Ozawa methods independently, suggests a typical three-staged process for the crystallization. As reflected by the change of the local Avrami exponent with the fraction crystallized, nucleation dominates the whole process that can be illustrated phenomeno-logically with the percolation model. This work is helpful for understanding the formation and thermal stability of U-based amorphous alloys, and also for the development of new materials of this kind. (C) 2016 Elsevier B.V. All rights reserved.