TiAl alloys demonstrate significant application potential in the aerospace field because of their low density, high specific stiffness and strength, and excellent high temperature mechanical properties. However, challenges such as poor room-temperature plasticity, limited damage tolerance, and difficulties in hot working still hinder their widespread use in practical engineering. Research has suggested that obtaining a uniform and fine lamellar microstructure through microstructural control is an effective approach for enhancing room-temperature plasticity and improving workability. This study focused on a Ti-42Al-6.5V-2Zr alloy, which was subjected to quenching from the β single-phase region to obtain a microstructure dominated by lath martensite α2. Subsequent holding and loading experiments were performed on the martensitic structure to achieve microstructural refinement of the TiAl alloy. The subsequent microstructural evolution during intermediate-temperature holding and loading was studied by high-energy X-ray diffraction. The applied stress significantly promotes the phase transformation from α2 to γ.The mechanical anisotropy between the α2 and γ phases leads

to rapid accumulation of elastic strain energy and crystal defects within the α2 phase, which markedly accelerates the formation of the lamellar γ phase.