Gamma titanium aluminide intermetallic alloys are lightweight heat-resistant materials and their thermo-mechanical properties are affected by hot working. The aim of this study was initially to evaluate the texture developed in a cast Ti-48Al-2Cr alloy during thermo-mechanical treatment at 1000 $℃$ at different strain rates of 0.001, 0.01 and 0.1 s⁻¹. In addition, development of ultrafine grained microstructure was assessed for different strain rates. The results of pole figures suggested that the amount of the strain rate is one of the most crucial parameter affecting the type of texture developed. So that, when the rate of strain increased from 0.001 to 0.1 s⁻¹ the texture changed from Copper to Brass. The results also showed that by increasing the strain rate yield strength, hardness increased substantially. Microstructural study showed that by increasing strain rates, the mean size of the grains reduced even down to nano-range (i.e. <100 nm). A high-volume fraction of dynamic recrystallization occurred when strain rate was more than 0.01 s⁻¹. Abnormal grain growth is also observed when the samples are hot strained by low strain rates.

伽马钛铝化物金属间合金是轻质的耐热材料，其热机械性能会受到热加工的影响。这项研究的目的最初是评估在1000的热机械处理期间铸造的Ti-48Al-2Cr合金中产生的织构。$℃$在0.001、0.01和0.1 s ^-1的不同应变率下。此外，评估了不同应变速率下超细晶粒组织的发展。极图结果表明，应变速率的大小是影响所开发纹理类型的最关键参数之一。因此，当应变率从0.001增加到0.1 s ^-1时，织构从铜变到黄铜。结果还表明，通过提高应变率屈服强度，硬度显着提高。显微组织研究表明，通过提高应变速率，晶粒的平均尺寸甚至可以减小到纳米范围（即<100 nm）。当应变速率大于0.01 s ^-1时，发生大量动态再结晶。当样品以低应变速率热应变时，也会观察到异常的晶粒长大。