High temperature service capability and deformation behavior of γ + α₂ TiAl alloy made through ingot melting route has been studied under tensile load at temperature (T = 750–900 °C) and strain rate (\(\dot{\varepsilon }\) = 10⁻¹–10⁻³ s⁻¹). Reduction in strength is not seen till 800 °C at all the three strain rates, indicating safe use of alloy up to this temperature. Further, it has been observed that % elongation to failure (e_f) increases with increase in T or decreasing \(\dot{\varepsilon }\). Significant increase in e_f is observed with decrease in \(\dot{\varepsilon }\) from 10⁻² to 10⁻³ s⁻¹ at test temperature of 850 °C or above. At 900 °C and 10⁻³ s⁻¹, e_f is observed to be 47%. Microstructure consisting of γ and α₂ phases with lamellar morphology and β phase are distributed uniformly along grain boundaries. Refinement of lamellae and dynamic recrystallization (DRX) assisted by twinning is found to be the primary reason for flow softening, which lead to improvement in e_f of alloy at T ≥ 850 °C. It is observed that temperature plays a major role in initiation of DRX as observed with increasing T whereas \(\dot{\varepsilon }\) plays major role in twinning as observed with decreasing \(\dot{\varepsilon }\) even at lower temperatures.

高温服务能力和变形特性γ  +  α ₂的TiAl合金锭通过熔化路线由已经在该温度下拉伸载荷下的研究（Ť  = 750-900℃）和应变率（\（\点{\ varepsilon} \）  = 10 ^-1 –10 ^-3  s ^-1 )。在所有三种应变速率下，直到 800 °C 时才观察到强度降低，表明合金在此温度下可以安全使用。此外，已经观察到，破坏伸长率 ( e _f ) 的百分比随着T 的增加或\(\dot{\varepsilon }\) 的降低而增加。e _f显着增加在 850°C 或更高的测试温度下观察到\(\dot{\varepsilon }\)从 10 ^-2到 10 ^-3  s ^{-1 的减少}。在900℃和10 ^-3  s ^{-1 时}，观察到e _f为47%。由具有层状形态的γ和α ₂相和β相组成的显微组织沿晶界均匀分布。发现孪晶辅助下的片晶细化和动态再结晶 (DRX) 是流动软化的主要原因，这导致合金在T 时的e _f提高 ≥ 850 °C。据观察，随着T 的增加，温度在 DRX 的起始中起主要作用，而\(\dot{\varepsilon }\)在孪晶中起主要作用，如观察到的\(\dot{\varepsilon }\) 降低，即使在较低的温度。