To achieve grain refinement, the recrystallization behavior of B2 matrix phase in a Ti₂AlNb-based alloy was investigated by performing a series of thermal compression tests at temperatures in the range of $950~1025°C$ with strain rates from $0.001s^{-1}$ to$1s^{-1}$. Instead of water quenching immediately after deformation, samples were further held at deformation temperature for a certain time, in order to make the heat-affecting time at various strain rates consistent. Electron back scattered diffraction (EBSD) technique was employed for microstructure analysis, in combination with grain orientation spread (GOS) method to distinguish recrystallized grains from non-recrystallized grains. The results reveal that: (i) dynamic recrystallization (DRX) is not easy to occur in this alloy, and increasing strain rate leads to a decrease of DRX fraction; (ii) when evaluated on the same time scale, the sample at strain rate of $\dot{\epsilon }=0.1s^{-1}$ has the highest recrystallized fraction among all applied strain rates, which provides sufficient nucleation rate of DRX as well as notable grain growth during post-dynamic recrystallization (PDRX); and (iii) the recrystallization evolution with temperature changes is closely linked to the phase transformation in Ti₂AlNb. The presence of O and α₂ phases affects recrystallization process via pinning effect and particle stimulated nucleation (PSN) mechanism. This work therefore provides a new understanding of recrystallization behavior during and post deformation of Ti₂AlNb-based alloy, which is meaningful to refine grains by combining the contributions of DRX and PDRX.

为了实现晶粒细化，B2的基体相的在钛的再结晶行为₂基于AlNb合金通过在的范围内的温度执行一系列的热压缩试验，研究$950~1025℃$ 应变率从 $0.001{秒}^{-1}$ 到$1{秒}^{-1}$. 试样在变形后不立即水淬，而是在变形温度下进一步保温一定时间，使不同应变率下的热影响时间一致。采用电子背散射衍射 (EBSD) 技术进行微观结构分析，并结合晶粒取向扩展 (GOS) 方法来区分再结晶晶粒和非再结晶晶粒。结果表明：(i)该合金不易发生动态再结晶(DRX)，增加应变速率导致DRX分数降低；(ii) 在相同的时间尺度上评估时，样品在应变速率为$\dot{\epsilon }=0.1{秒}^{-1}$在所有施加的应变率中具有最高的再结晶率，这提供了足够的 DRX 成核率以及在动态再结晶 (PDRX) 期间显着的晶粒生长；(iii) 随着温度变化的再结晶演变与 Ti ₂ AlNb的相变密切相关。O和α ₂相的存在通过钉扎效应和粒子受激成核（PSN）机制影响再结晶过程。因此，这项工作提供了对 Ti ₂ AlNb 基合金变形期间和变形后再结晶行为的新理解，这对于通过结合 DRX 和 PDRX 的贡献来细化晶粒具有重要意义。