宏-微-纳跨尺度下ZChSnSb/Sn多层合金界面作用机理与结合性能调控研究

界面作用机理是机械表界面科学与摩擦学性能研究的重点和难点。项目以ZChSnSb/Sn多层合金界面为研究对象，推导界面端和界面角点的奇异性应力场模型，量化界面奇异性应力场对于结合强度的影响，建立奇异性应力场与结合性能的多维度关联；制备多层合金复合材料试件，分析合金层界面间的金相组织，探索界面新相的形成规律和各相间的作用机理；建立表征界面体系能量的分子动力学模型，研究界面结构体系能量，考虑合金蠕变对结合界面受力、合金内应力及界面金相组织变化的影响，得到界面结合能随合金层比例的变化规律、合金层最佳厚度、最佳过渡层厚度以及合金界面结合最佳温度和时间；综合试验测试，优化合金成分、合金层厚度和工艺参数，构建表征界面奇异应力、界面结合能、蠕变特性与界面结合强度的本构关系，建立多层合金界面结合性能评价准则，实现界面结合性能的调控，为发展多层合金新型结合技术提供理论指导，推进核心基础件的高端化进程。

Interface interaction mechanism is the focus and difficulty of research on mechanical surface & interface science and tribological properties. This project makes ZChSnSb/Sn multi-layer alloy interfaces as research object, through deriving the singular stress field model of interface section and interface angular point, the influence of singular stress field on bonding strength of the interface will be quantified and the multi-dimensional correlation of singular stress field and bonding performance will be deduced. The test specimens with multi-layer alloy composite material will be prepared. The micro-structure of alloy layer interface, the formation rule of new phase and the mechanism among different phases will be explored. The energy of interface structure system will be studied by establishing the molecular dynamics model of interface energy system. Considering the effect of alloy creep on interface stress, the internal stress on alloy and the micro-structure variation of interface, the varying rule of interface bonding energy with the ratio of alloy layer, the optimum thickness of alloy layer, the optimum thickness of transition layer and the optimum temperature and time of alloy interface bonding will be obtained. Through optimizing the alloy compositions, the thickness of alloy layer and the process parameters with combination of experimental tests, the constitutive relationship of interface singular stress, interface bonding energy, creep mechanical properties and interface bonding strength will be obtained, the evaluation criteria on bonding properties of multi-layer alloy will be built, thus realizing the regulation of bonding properties, as well as providing theoretical guide for new bonding technologies of multi-layer alloy and promoting the top progress of national key components.