Ti-Al系合金作为新一代轻质高温结构材料，是当前空天材料的研究热点。如何发展更高服役温度的Ti-Al系合金（> 800 ℃），近年来受到密切关注。Pt族金属中的Ru元素具有高熔点、抗氧化、极耐蚀、低成本的优点，可显著提升结构材料的高温性能。因此，本项目拟对Ti-Al进行Ru合金化，通过研究Ti-Al-Ru合金凝固组织及其力学关联中的几个关键问题，为发展高温Ti-Al系合金提供一条可能的途径。项目将围绕以下四部分开展：(1)平衡凝固下Ti-Al-Ru合金组织结构与相变路径；(2)宽参数凝固/冷却下组织形成规律及其多尺度特征；(3)时效过程中G相析出调控及其对力学性能的影响；(4)α2+γ双相Ti-Al-Ru合金的增塑途径及机理。在此基础上，将阐明Ru元素对Ti-Al合金凝固组织的作用规律及机制，并揭示合金组织结构-强塑性关联机理与调控方法，为发展Ti-Al-Ru合金提供理论支撑。

TiAl-based alloys are considered as the light-weight high-temperature structural materials in the next-generation, becoming a research hotspot in the field of advanced aerospace materials. How to further improve the service temperature of TiAl-based alloys (> 800 °C) and develop high temperature Ti-Al alloys, has attracted close attentions in recent years. The Ru element (belong to Platinum Group Metals, PGMs) possesses the advantages of high melting point, excellent oxidation resistance, extremely high corrosion resistance and low cost. As the alloying element, it has been successfully applied in some metallic materials such as superalloy, titanium alloys, steel, which can significantly improve the high-temperature performance of these materials.. Therefore, this aim of the current project is to inducing the element of Ru into TiAl-based alloys. A potential way will be founded to guide the development of new generation Ti-Al alloys, by means of investigating several key issues involving with the solidification microstructure and its relationship to mechanical properties in the Ti-Al-Ru alloy. The project will be carried out in the following four aspects: (1) the microstructure evolution and phase transition path in Ti-Al-Ru alloys under equilibrium solidification; (2) the microstructure formation and its multi-scale characteristics under temperature-controlled solidification/cooling (over a broad range of parameters); (3) the precipitation and control of the G phase during aging and its effects on the mechanical properties; (4) the way and its mechanism of the plasticity improvement for the (α2 + γ ) Ti-Al-Ru alloy. On that basis, the influence rules and the mechanisms of Ru element on the solidification microstructure of TiAl alloy will be clarified. Also, the relationship between the microstructure and the mechanical properties (strength and plasticity) of Ti-Al-Ru alloy will be revealed, followed by obtaining a pathway for the microstructure control. These results will provide theoretical support to the development of Ti-Al-Ru alloy.