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《Acta Metallurgica Sinica》 2015-05
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HUANG Huogen;WANG Yingmin;CHEN Liang;PU Zhen;ZHANG Pengguo;LIU Tianwei;China Academy of Engineering Physics;Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology;  
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 U- Co 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 U66.7Co33.3composition. 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 calculated to be 0.535, and moreover, the exothermal enthalpies of crystallization were determined to be in a range of 4.8~8.5 k J/mol. Upon room temperature electrochemical polarization in a 50 × 10- 6Cl-electrolyte, these amorphous alloys exhibited corrosion potentials as high as about- 50 m V, being much more positive than that of depleted uranium. In these amorphous alloys, it has also been found that the rust resistance performance appears to be parallel to the ease of amorphous phase formation.
【Fund】: 国防基础科研计划项目B1520133007;; 中国工程物理研究院科技发展基金项目2013A0301015资助~~
【CateGory Index】: TG139.8
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