To strengthen TiAl alloys, micro-nano Ti₂AlC precipitates were fabricated in situ by spark plasma sintering using Ti–48Al–2Nb–2Cr pre-alloyed powder and multilayer graphene oxide. The effect of micro-nano Ti₂AlC precipitation on the hot deformation behavior of Ti–48Al–2Nb–2Cr alloy was systematically studied at 1100, 1150, and 1200 °C under strain rates of 0.01, 0.1, and 1 s⁻¹. The fully lamellar structure was transformed to a nearly lamellar structure when the graphene content was increased. In addition, the lamellar colony size significantly decreased and the number of Ti₂AlC particles increased with increasing graphene content. The hot deformation results show that the flow stress of the Ti₂AlC–TiAl composites first increased and then decreased with increasing graphene content, reaching the maximum with the addition of 0.3 wt% graphene. Micro-nano Ti₂AlC particles hindered dislocation slip, leading to a strengthening effect. However, Ti₂AlC particles promoted dynamic recrystallization through grain refinement and dislocation pile-up, resulting in a softening effect. The strengthening and softening effects of the Ti₂AlC–TiAl composites depend on the Ti₂AlC particle content.

为了强化 TiAl 合金，使用 Ti-48Al-2Nb-2Cr 预合金粉末和多层氧化石墨烯通过放电等离子烧结原位制备微纳米 Ti _{2 AlC 沉淀物。}系统研究了微纳米Ti ₂ AlC 析出对Ti-48Al-2Nb-2Cr 合金在1100、1150 和1200 ℃、0.01、0.1 和1 s ^-1应变速率下的热变形行为的影响。当石墨烯含量增加时，完全层状结构转变为接近层状结构。此外，随着石墨烯含量的增加，片状菌落尺寸显着减小，Ti _{2 AlC 颗粒数量增加。}热变形结果表明，Ti _{2的流变应力}AlC-TiAl复合材料随着石墨烯含量的增加先增加后减少，在添加0.3 wt%石墨烯时达到最大值。微纳米Ti ₂ AlC颗粒阻碍位错滑移，产生强化效应。然而，Ti ₂ AlC 颗粒通过晶粒细化和位错堆积促进动态再结晶，从而产生软化效应。_{Ti 2} AlC-TiAl 复合材料的强化和软化效果取决于 Ti ₂ AlC 颗粒的含量。