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急冷U-V合金的相组成与热稳定性研究
Phase Composition and Thermal Stability of Rapidly Solidification U-V Alloys
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- DOI:
- 作者:
- 张鹏国 张培 柯海波 吴敏 黄火根
ZHANG Pengguo;ZHANG Pei;KE Haibo;WU Min;HUANG Huogen
- 作者单位:
- 中国工程物理研究院材料研究所
Institute of Materials,China Academy of Engineering Physics,Jiangyou 621907,China
- 关键词:
- 铀合金 钒合金 非晶相 非平衡凝固
uranium alloy vanadium alloy amorphous phase non-equilibrium solidification
- 摘要:
- 铀-钒合金在核工业领域具有潜在应用,为更充分地了解其合金化特性,需进一步确认这种合金在急冷条件下的相组成和热稳定性。在共晶点U82V18附近设计了系列成分的U-V合金,通过甩带技术制备急冷条带样品,采用X射线衍射和差式扫描量热方法研究了其相组成与热稳定性。结果表明,它们在急冷凝固条件下(冷却速率达106K/s量级)形成了α-U固溶体、V固溶体与非晶的组成,比平衡凝固条件下多生成了非晶相。这些急冷合金在升温过程中,除了非晶晶化过程外,其他相转变过程基本符合平衡态相图特征。相比于其它合金,U82V18合金中的非晶相具有最高的热稳定性,这应该归功于其共晶成分优势。本研究证实了熔体凝固速率对U-V合金的相组成存在影响。Uranium-vanadium(U-V)alloys have potential applications in nuclear industries.The phase composition and thermal stability of the alloy under rapidly solidification condition need to be further confirmed in order to fully understand its alloying characteristics.The U-V alloy with a series of components was designed near eutectic point U82V18,and the samples of rapidly solidification ribbons were prepared by single-roller technology.The phase composition and thermal stability of the U-V alloy were studied by XRD and DSC.The results show that the composition ofα-U solid solution,V solid solution and amorphous phase is formed under the condition of rapidly solidification(cooling rate up to 106K/s),and the amorphous phase is formed under the condition of equilibrium solidification.In addition to the amorphous crystallization process,other phase transition processes of these rapidly solidification alloys basically conform to the characteristics of equilibrium phase diagrams during the heating process.Compared with other alloys,the amorphous phase thermal stability of U82V18alloy is the best,which is determined by the eutectic composition characteristics.