【摘要】 研究了热处理对Ti₂AlNb合金板材显微组织、拉伸性能及其均匀性的影响。结果表明，O相尺寸随时效温度升高而增大，含量基本保持不变。经960℃固溶+850℃时效处理后，板材O相[001]//TD织构完全消失，不同方向拉伸性能较为均匀；两种不同尺寸的O相为合金提供了良好的强度和塑性，室温断后伸长率不低于10%，在750℃的高温拉伸条件下合金屈服强度仍能达到450 MPa以上。固溶温度和时效温度升高使O相尺寸增大，削弱了界面强化作用，进而导致板材强度降低。更多还原

【Abstract】 The effects of heat treatment on the microstructure, tensile properties, and their uniformity of Ti₂ AlNb alloy plates were investigated. The results indicate that the size of the O phase increases with increasing aging temperature, while its content remains essentially unchanged. After solution treatment at 960 °C and aging at 850 °C, the [001]//TD texture of the O phase in the plate completely disappears, resulting in relatively uniform tensile properties in different directions. The O phases with two distinct sizes provide the alloy with a favorable combination of strength and ductility, achieving a room-temperature elongation after fracture of no less than 10%. Furthermore, the alloy retains a yield strength exceeding 450 MPa under tensile conditions at 750 °C. Increasing the solution and aging temperatures leads to coarsening of the O phase, weakening the interfacial strengthening effect and consequently reducing the strength of the plate.更多还原