In the present study, a two-phase Ti₂AlNb-based alloy with a nominal composition of Ti–22Al–25Nb (at%) comprising the dominant O + B2/β phase was explored. The microstructural evolution and tensile properties are studied by applying different heat treatment methods of water-cooling (WC, 140 °C/s) and furnace-cooling (FC, 0.08 °C/s) after heat treatment at 1015 °C for 40 min, followed by aging treatment at 800 °C for 1, 5, and 100 h. The results indicated that the morphologies of solution-treated alloys after different cooling methods have a significant distinction. The WC alloy consists of a continuous B2/β phase and a few remnant O phase, whereas the FC alloy comprises a mass of lath O phase and discontinuous B2/β phase. The Widmanstätten O + B2 structures were generated in the following aging treatment. The α₂ phase was not detected during the heat treatments in the present work. The B2 phase and O phase in the aged WC and FC alloys follow the classical orientation relationship: ${(110)}_{B2}//{(001)}_O,{[\bar{1}11]}_{B2}//{[1\bar{1}0]}_O$. The room-temperature ultimate tensile strength (UTS) and elongation to failure (EL) of the FC and aged FC alloys are higher than the WC and aged WC alloys, except for the 100 h-aging condition. On the contrary, the high-temperature UTS and EL of the aged WC alloys are higher than the aged FC alloys. The existence of the O/O phase boundaries, the coarsening of the B2 grain boundary and discontinuous precipitation harmed the performances of the studied alloys. Beyond that, the fracture mode of the explored alloys with different heat treatment methods was also analyzed.

在本研究中，两相Ti ₂探索了标称成分为Ti-22Al-25Nb（原子％）的AlNb基合金，其中O + B2 /β相占主导地位。通过在1015°C热处理40分钟后采用水冷（WC，140°C / s）和炉冷（FC，0.08°C / s）的不同热处理方法研究组织的演变和拉伸性能，然后在800°C下老化1、5和100小时。结果表明，固溶处理的合金在不同的冷却方法后的形态具有明显的区别。WC合金由连续的B2 /β相和少量残余O相组成，而FC合金由板条O相和不连续的B2 /β相组成。在以下时效处理中产生了WidmanstättenO + B2结构。的α ₂在本工作的热处理过程中未检测到相。老化的WC和FC合金中的B2相和O相遵循经典的取向关系：${（110）}_{乙\mathrm{2个}}//{（001）}_{Ø}，{[\stackrel{〜}{\mathrm{1个}}11]}_{乙\mathrm{2个}}//{[\mathrm{1个}\stackrel{〜}{\mathrm{1个}}0]}_{Ø}$。FC和时效FC合金的室温极限拉伸强度（UTS）和断裂伸长率（EL）高于WC和时效WC合金，但100 h时效条件除外。相反，时效WC合金的高温UTS和EL高于时效FC合金。O / O相界的存在，B2晶界的粗化和不连续的析出会损害所研究合金的性能。除此之外，还分析了采用不同热处理方法的探明合金的断裂模式。