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研究了Ti-22Al-25Nb合金的显微组织和力学性能,重点介绍了等温锻造温度、固溶时效处理对合金力学性能的影响规律。结果表明:随着等温锻造温度的升高,合金的强度和塑性先增加后降低。在O+B2两相区固溶时,随着固溶温度的升高,具有较高塑性的B2相体积分数的增加和等轴颗粒的减少是合金具有较高塑性的主要原因;而在α_2+B2+O3相区固溶时,片层厚度的减小有利于合金强度的提高,但过大的B2相晶粒尺寸和较细的片层厚度则对合金的塑性不利。相的含量、形态、尺寸对合金力学性能的影响较大,尽可能在B2相变点附近进行等温锻造,以控制等轴颗粒数量和B2相晶粒尺寸,在低温时效以获得较细的片层组织从而提高合金的强度和塑性。
The microstructure and mechanical properties of Ti-22Al-25Nb alloy were investigated. The influence of isothermal forging temperature and solution treatment on the mechanical properties of the alloy was mainly introduced. The results show that with the increase of isothermal forging temperature, the strength and plasticity of the alloy first increase and then decrease. With the increase of solution temperature, the increase of volume fraction of B2 phase and the decrease of equiaxed particles with higher plasticity are the main reasons for the higher plasticity of the alloy in the solution phase of O + B2. However, + B2 + O3 phase zone, the decrease of sheet thickness is beneficial to the improvement of alloy strength, while the excessive B2 phase grain size and the thinner sheet thickness are unfavorable to the plasticity of the alloy. Phase content, morphology and size of the mechanical properties of the larger, as much as possible near the B2 transformation temperature isothermal forging to control the number of equiaxed particles and B2 phase grain size, aging at low temperature to obtain a thin slice Layer organization to improve the strength and ductility of the alloy.