本文系统研究了 ZTA15 铸造钛合金在不同合金元素质量比条件下的微观与宏观组织特征及其高温力学性能，并进一步探讨了不同铸造工艺对合金组织与性能的影响机制。 通过熔炼与浇注工艺制备了单铸试验试样，并在完成热等静压及退火处理后，对试样的化学成分和力学性能进行了系统分析，从而确定了具有良好综合性能的合金元素配比范围。 此外，对熔模精密铸造与石墨型铸造两种工艺条件下制备的试样进行了对比研究，明确了铸造工艺对高温力学性能的影响规律。 基于实验结果，确定了 ZTA15 铸造钛合金在 400 ℃高温服役环境下性能最优的合金元素质量比区间及其适配的铸造工艺。

The microscopic and macroscopic microstructural characteristics as well as the high-temperature mechanical properties of ZTA15 cast titanium alloys were systematically investigated under various mass ratios of alloying elements. Furthermore, the influence mechanisms of different casting processes on the microstructure and mechanical performance of the alloy were explored. Single-cast test samples were fabricated through melting and casting procedures. Following hot isostatic pressing and annealing, the chemical composition and mechanical properties of the samples were comprehensively  analysed to determine the optimal alloying element ratio range that results in superior overall performance. Additionally, a comparative analysis was conducted on samples produced via two distinct casting techniques, investment precision casting and graphite mold casting, to elucidate the specific effects of the casting process on high-temperature mechanical properties. On the basis of the experimental findings, the optimal mass ratio range of alloying elements and the corresponding casting process for ZTA15 cast titanium alloy under high-temperature service conditions of 400 ℃ are identified.