B2相区等温锻造的Ti-22Al-25Nb合金棒材940℃固溶后，在760～840℃时效处理，对其显微组织、拉伸及蠕变性能进行研究。结果表明：不同温度时效处理的显微组织均由初生粗板条状O相、二次析出的细板条状O相和B2基体组成，其中二次析出的O相可以通过时效温度来调节。随着时效温度的升高， Ti2 AlNb合金的室温及650℃高温拉伸强度降低而塑性提高；较低的时效温度（760℃）处理可以获得更好的抗蠕变性能。
Ti-22Al-25Nb( at.%) alloy bars were isothermally forged at B2 phase region and solution treated at 940℃, then aging treated at 760 ℃to 840 ℃.Then the microstructure evolution and mechanical properties of the bars were studied.The results indicate that the microstructures at different aging temperatures contain primary lamellar O phase, secondary fine lamellar O phase and B2 matrix.The size and volume fraction of secondary fine lamellar O phase can be adjusted through aging treatment.The mechanical properties show that as aging temperature increasing, the strength including room-temperature and 650 ℃ high-temperature tensile strength decrease, while the ductility increases.The lower aging-temperature (760 ℃) has better creep resistance.
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