This work aims at identifying, by coupled X-Ray diffraction, scanning and transmission electron microscopy (XRD, SEM and TEM) observations, the microstructural evolution mechanisms occuring when an atomized Ti-47Al-2Cr-2Nb-0.2W powder is densified by spark plasma sintering (SPS). For this purpose, interruptions of the SPS cycle have been performed to follow the evolution of the microstricture step by step. During heating-up, the microstructure undergoes successive transformations. At begaining temperature of 1100℃ the α phase transforms into γ and residual B2. The γ phase formed is supersaturated in W. At temperature above 1200℃, TEM observations show that the repartition of the plastic dedormation is correlated to the dendritic microstructure, and the deformation induced α₂ →γ phase transformation and the twins.