Using cold roll bonding and annealing to process Ti/Al multi-layered composites from elemental foils

In this study, multi-layered Ti/Al composites were prepared using a cyclic cold roll bonding/annealing process. The effect of initial thickness reduction by cold roll bonding and cyclic cold roll bonding/annealing on the formation and development of the titanium aluminide phase has been investigated in detail. The phases formed were characterized using light microscopy equipped with digital image analysis system and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The thermodynamics and kinetics of the diffusion reaction were investigated using differential scanning calorimetry (DSC) and enthalpy (H), entropy (S) and capacity (C) thermodynamic calculations. The diffusion reaction mechanism at this stage was discussed.