U-Co与U-Fe基础体系非晶形成能力的比较
收稿日期: 2019-10-21
修回日期: 2020-01-05
网络出版日期: 2020-01-14
基金资助
国防科技基金项目(1300025);中国工程物理研究院规划项目(TCGH071601)
Comparison of Glass Forming Ability Between U-Co and U-Fe Base Systems
Received date: 2019-10-21
Revised date: 2020-01-05
Online published: 2020-01-14
Supported by
National Defense Science and Technology Foundation of China(1300025);Planning Foundation of China Academy of Engineering Physics(TCGH071601)
黄火根 , 张鹏国 , 张培 , 王勤国 . U-Co与U-Fe基础体系非晶形成能力的比较[J]. 金属学报, 2020 , 56(6) : 849 -854 . DOI: 10.11900/0412.1961.2019.00349
Because of having better corrosion resistance properties than crystalline uranium alloys, U-based metallic glasses show strong potential of applications in nuclear fields. U-Co and U-Fe are U-based important base glass systems, from which almost all the reported multi-component U-based amorphous alloys derive. However, which system possessing higher glass forming ability is unclear yet. Therefore, the relationship between the glass formation and the solidification rate is studied on two glassy alloys U66.7Co33.3 and U69.2Fe30.8 in this work, which are the best glass former in the corresponding system. A series of amorphous samples were prepared by modifying the cooling rate of their melts, and then were measured by using XRD and calorimetric analysis technique. The results show that both alloys were able to nearly amorphize completely at higher cooling rate, and tended to segregate U6Mn-typed crystalline phase when the cooling rate declined to some extent. In contrast, the U-Fe alloy needs a much lower critical cooling rate to achieve fully amorphous structure, directly demonstrating that U-Fe system possesses stronger glass forming capacity than U-Co. The reason for this conclusion is that the former system is of both thermodynamic and kinetic advantages for glass formation. This result can be applied as the foundation to exploit superior novel multicomponent U-based amorphous alloys.
Key words： uranium alloy; amorphous alloy; metallic glass; glass forming ability
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