【摘要】 铀合金作为一种重要核燃料,其体心立方结构的高温稳定的γ-U合金具有较好的综合性能,是合金设计所追求的目标。本文引入描述稳定固溶体结构的"团簇加连接原子"模型,用于建立γ-U固溶体合金的结构模型和相应成分式,指出其结构单元为体心立方第一近邻配位多面体团簇加3个连接原子构成。进而利用该结构单元对现有合金成分进行了解析,能够稳定形成体心立方bcc结构的合金均满足上述模型,如[Mo-U₁₄]Mo₃（U-10.7Mo）,[Zr-U₁₄]Nb₃（U-7.5Nb-2.5Zr,即不锈铀）等,这些合金实际上均在各自体系中具有最优良的结构稳定性,显示出优异的耐蚀性。本文证实,基于团簇加连接原子模型的成分设计方法在预测γ-U合金成分与性能上具有重要指导价值。更多还原

【Abstract】 As an important nuclear fuel, γ-U alloys with the body centered cubic（bcc） structure have high temperature stability and comprehensive performance among uranium alloys, which are the target of recent alloy design. In the present paper, a cluster-plus-glue-atoms structure model, which is used to describe solid solution alloys, were applied to build the component formulas of γ-U solution alloys, and clarify that the structural unit of γ-U alloys is composed of bcc first neighbor coordination polyhedron cluster and three glue atoms. Further, an enormous amount of the existing alloy components were analyzed based on the model. Results indicate that all the bcc-stable alloys satisfy the model, such as [Mo-U₁₄]Mo₃（U-10.7 Mo）, [Zr-U14]Nb3（U-7.5 Nb-2.5 Zr, i.e., Mulberry alloy）, which all exhibit the best structural stability in their respective systems and show excellent corrosion resistance. Therefore, the component design method based on cluster-plus-glue-atoms model clusters has important guiding value in predicting alloys composition and performance.更多还原