Influence of Nb and Cu Elements on the Intermetallic Particles Morphology in Ti/Al Multilayer Composite Processed Through Hot Pressing and Rolling

摘要

Ti–Al–Nb composites were produced by solid state diffusion bonding through hot pressing and rolling followed by annealing at 700?°C for 0.5, 1, 1.5 and 2?h. The morphologies of TiAl~(3)intermetallics were investigated by Scanning Electron Microscopy combined with Energy-dispersive X-ray spectroscopy. Titanium tri-aluminide (TiAl~(3)) particles with blocky morphology were dispersed into Aluminum matrix. In the presence of niobium and copper, TiAl~(3)particles were produced in different sizes and morphologies. The presence of Nb in the composite led to the formation of irregular angular morphology, while the copper resulted in cubic morphology of the intermetallic particles. The EDS results indicated that TiAl~(3), (Ti, Nb)Al~(3)and (Ti, Nb, Cu)Al~(3)intermetallic compounds appeared near Ti zone, Nb Zone and in the presence of Cu, respectively.