Ti–22Al–25Nb is a representative of Ti₂AlNb alloys with excellent comprehensive properties, which has great application prospects in the aerospace field. Herein, high‐temperature tensile plastic deformation behavior and dynamic recrystallization process of Ti–22Al–25Nb alloy are researched during 750–990 °C. From 750 to 870 °C, plasticity is gradually improved with temperature increasing, and the fracture mode is crack aggregation. From 900 to 930 °C, the content of B2 phase increases and plasticity is significantly improved because crack along the grain is suppressed by combined precipitation of three phases B2 + O + α₂ at grain boundaries with large areas. From 960 to 990 °C, the alloy is mainly composed of B2 phase and has best plastic deformation performance. Fully dynamic recrystallization of B2 phase happens at 990 °C. Texture strength is strengthened by intense plastic deformation, but it is weakened by dynamic recrystallization subsequently.

中文翻译：

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Ti–22Al–25Nb合金在750–990°C下的变形行为和动态再结晶

Ti-22Al-25Nb是具有优良综合性能的Ti ₂ AlNb合金的代表，在航空航天领域具有广阔的应用前景。在此，研究了Ti–22Al–25Nb合金在750–990°C下的高温拉伸塑性变形行为和动态再结晶过程。从750到870°C，可塑性随着温度的升高而逐渐提高，断裂模式为裂纹聚集。从900至930℃，B2相增加和可塑性含量显著改善，因为沿晶裂纹是由三个阶段B2 + O +α合并沉淀抑制₂在大面积的晶界处。从960到990°C，该合金主要由B2相组成，具有最佳的塑性变形性能。B2相的完全动态重结晶发生在990°C。剧烈的塑性变形会增强织构强度，但随后的动态再结晶会削弱织构强度。