Preparation and Thermal Stability of Large-sized TiAl/Ti3Al Micro-laminated Thin Sheets

Large-sized TiAl/Ti3Al micro-laminated composite thin sheet with thickness of 0.1-10 mm was prepared by high- powerful electron beam physical vapor deposition technology in laboratory. The composition and microstructure of TiAl/Ti3Al were chacterized by XRD and SEM. The results indicated that the prepared material with visible lamellar structure was alternately composed of α2-Ti3Al and γ-TiAl phase and the mean grain size of TiAl was about 1-2 μm. The degradation process was also investigated by high temperature annealing at various temperatures for 3 h.