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Indexed by:期刊论文

Date of Publication:2017-01-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI

Volume:691

Page Number:436-441

ISSN No.: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.