Abstract The dynamic recrystallization (DRX) and phase transformation (PT) behavior of a wrought β-γ TiAl alloy during hot compression under various deformation temperatures were investigated. The typical work hardening and flow softening features indicated that DRX was the dominating softening mechanism. Both γ-DRX and β-DRX took place during the hot compression. γ-DRX was triggered at all compression temperatures, while the β-DRX was induced when the compression temperature was above 1000 °C. The hot deformation kinetics was calculated, which showed that DRX behavior existed in the whole hot compression process, and the DRX volume fraction increased with the increase of the compression temperature. Combined with the microstructure observation, it concluded that the β/B2+α2→γ PT occurred at 850 °C and 1000 °C, while the γ→β/B2 PT happened at 1050 °C during hot compression, which is important to optimize microstructure. Moreover, the hot compression mechanism changed from dislocation gliding to grain-boundary sliding was discussed.

中文翻译：

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变形β-γ TiAl合金在热压缩过程中的动态再结晶和相变行为

摘要 研究了变形 β-γ TiAl 合金在不同变形温度下热压缩过程中的动态再结晶 (DRX) 和相变 (PT) 行为。典型的加工硬化和流动软化特征表明 DRX 是主要的软化机制。γ-DRX 和 β-DRX 均发生在热压缩过程中。γ-DRX 在所有压缩温度下都被触发，而 β-DRX 在压缩温度高于 1000 °C 时被诱导。计算热变形动力学，表明DRX行为存在于整个热压缩过程中，DRX体积分数随着压缩温度的升高而增加。结合显微组织观察得出β/B2+α2→γ PT发生在850℃和1000℃，而 γ→β/B2 PT 在热压缩过程中发生在 1050 °C，这对优化微观结构很重要。此外，还讨论了热压缩机制从位错滑移到晶界滑移的转变。