中文摘要：

利用“团簇加连接原子”结构模型解析典型高温近α-Ti合金Ti 1100成分，进而在此基础上添加Hf、Ta和Nb元素进行合金化，形成成分通式 [Al-（Ti13.7（Zr/Hf）0.3）]（Al0.69Sn0.18Si0.12（Mo/Ta/Nb）0.03）。合金组织结构分析和高温抗氧化性结果表明：Hf元素的添加并未改变合金的结构和组织，在此基础上，不同配比的Ta和Nb替代Mo时合金由片层转变β组织转变为等轴α组织；系列合金在800 ℃下，Hf替代Zr后合金的抗氧化能力显著提高，Ta和Nb进一步合金化后合金的抗氧化能力进一步增强，其100 h后的氧化质量增加约为（2.2±0.2） mg/cm^2。

英文摘要：

The composition characteristics of near α-Ti alloy Ti 1100 with the guidance of a cluster-plus-glue-atom model were investigated. A new alloy series with the cluster formula of [Al-（Ti13.7（Zr/Hf）0.3）]（Al0.69Sn0.18Si0.12- （Mo/Ta/Nb）0.03） was designed by adding minor Hf, Ta, and Nb. The structures of alloys were characterized, and the oxidation resistance properties were measured. The results show that the Hf substitution for Zr doesn’t influence the β transition lamellar microstructure. While that various combinations of Ta and Nb to substitute for Mo could form equiaxed α microstructure. The oxidation-resistant capacities of designed alloys are enhanced obviously at 800 ℃ in comparison with that of Ti 1100. The oxidation mass gains of the designed alloys with Hf, Nb and Ta co-alloying after 100 h at 800 ℃ are about （2.2±0.2） mg/cm^2.