(1. 北京航空材料研究院，北京 100095；
2. 宝鸡钛业股份有限公司，宝鸡 721014)
摘 要: 研究固溶温度、时效温度以及多重时效处理对Ti-24Al-15Nb-1Mo合金热轧板材拉伸性能的影响，对不同热处理工艺下板材的微观组织和拉伸断口形貌进行观察。结果表明：当固溶处理温度从990 ℃升高到1 010 ℃时，Ti-24Al-15Nb-1Mo合金热轧板材的室、高温强度均有所提高，塑性略有降低；当时效温度从815 ℃升高到850 ℃时，板材的室温和高温强度降低，塑性变化不明显；Ti-24Al-15Nb-1Mo合金热轧板材经990 ℃固溶处理后再进行多次时效处理，其拉伸性能变化不明显；增加时效次数，拉伸强度略微降低。
关键字: Ti3Al基合金；板材；拉伸性能；微观组织
microstructures of Ti3Al based alloy sheet
（1. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Baoji Titanium Industry Co., Ltd., Baoji 721014, China）
Abstract:The effects of solution treatment temperature, aging treatment temperature, multiple aging treatments on the tensile properties of Ti-24Al-15Nb-1Mo alloy hot-rolled sheet were studied. The microstructure and tensile fracture morphologies with different heat treatment conditions were observed by SEM. The results show that the tensile strength of Ti-24Al-15Nb-1Mo alloy hot-rolled sheet is improved, but the tensile ductility decreases slightly both at room and elevate temperature with the increase of solution temperature from 990 ℃ to 1 010 ℃. The tensile strength decreases with aging temperature increasing from 815 ℃ to 850 ℃, but the tensile ductility does not change obviously. No significant differences of tensile properties are observed after solution treatment and multiple aging treatments. Additional aging treatments results in slightly decrease of tensile strength.
Key words: Ti3Al-based alloys; sheet; tensile property; microstructure
