锡基巴氏合金SnSb8Cu4组成相的结构和性能的第一性原理计算

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中图分类号： TH142.3 文献标志码：A

文章编号：2096-2983（2025）03－0070-08

Abstract： The soft matrix and hard phases in the microstructure of tin-based Babbitt alloy have a decisive influence on its macroscopic properties，and the research and development of high-performance alloys requires an understanding of the structure and performance characteristics of each constituent phase.The structural stability， forming energy， binding energy， elastic properties and electronic characteristics of β -Sn and Cu6Sn5 in tin-based Babbitt alloy SnSb8Cu4 were investigated by using firstprinciples calculations based on density functional theory. The results show that the forming energies of β -Sn and Cu6Sn5 are 0.0053eV and -0.0681eV ， respectively， and their binding energies are -3.8439eV and -3.848leV respectively， indicating that both are thermodynamically stable. The elastic modulus and Vickers hardness of Cu6Sn5 are both higher than those of β -Sn， indicating that Cu6Sn5 has a greater influence on the strength and stiffness of the tin-based Babbitt alloy. However， β -Sn demonstrates beter plasticity and elastic anisotropy. The Fermi energy levels of β -Sn and Cu6Sn5 are 1.01eV and 1.18eV ， respectively， indicating that both have good structural stability.

Keywords： tin-based Babbit aloy; first-principles; structural stability; elastic property; electronic property

锡基巴氏合金具备优异的嵌藏性、顺应性和抗咬合能力，以及低摩擦因数和低膨胀系数的特点，在涡轮机、汽轮机、核电机组等设备的滑动轴承制造中得到广泛应用，成为高精度、高负荷运转设备中不可或缺的重要材料[1-3]。（剩余11178字）