Abstract
The formation of amorphous phase has been investigated in U-Co system over a wide range of compositions, namely, UxCo100-x (x=50~87.5) by mean of melt-spinning. Phase identification for the arc-melted ingots and rapidly quenched alloys, and the thermal stability of the amorphous phases thus formed have been examined by XRD and DSC, respectively. The component phases in the ingot alloys were structurally the same as those presented in UCo phase diagram, but were associated with a certain compositional metastability. Rapid quenching experiment revealed that the ease of formation of amorphous phase occurred within the composition range of 58.5≤x≤78, and amorphous phase was most readily formed in the vicinity of U66.7Co33.3 composition. The dynamical crystallization temperatures of the amorphous phases were determined to be 534~550 K at a DSC heating rate of 20 K/min, and the highest reduced crystallization temperature (relative to the liquidus temperature) as *国防基础科研计划项目B1520133007和中国工程物理研究院科技发展基金项目2013A0301015资助 收到初稿日期: 2014-10-27,收到修改稿日期: 2015-02-02 作者简介:黄火根,男, 1980年生,副研究员,博士 DOI: 10.11900/0412.1961.2014.00580 第623-630页 pp.623-630
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