Reaction behaviors occurring in Ti/Al foil metallurgy were systematically investigated.Particular emphasis was focused on the reaction between solid Al and Ti as well as subsequent reaction between TiAl_3 and Ti layer.In the solid reaction between Al and Ti,the presence of residual Al is mainly caused by inhomogeneous growth of TiAl_3 layer and micro-voids existing at the interface.However,through reaction between molten Al and Ti,TiAl_3/Ti multilayer can be achieved with complete consumption of Al.During subsequent high-temperature heat treatment,TiAl_3/Ti multilayer will eventually turn into Ti_3Al/TiAl multilayer accompanying with simultaneous formation and successive disappearance of intermediate phases,such as TiAl_2 and Ti_2Al_5.Moreover,it is found that the growth direction of TiAl layer changes as a function of annealing time between different couples in multi-intermetallics system. Reaction behaviors occurring in Ti / Al foil metallurgy were systematically investigated. Particle emphasis was focused on the reaction between solid Al and Ti as well as subsequent reaction between TiAl_3 and Ti layer. In the solid reaction between Al and Ti, the presence of residual Al is mainly caused by inhomogeneous growth of TiAl_3 layer and micro-voids existing at the interface. However, through reaction between molten Al and Ti, TiAl_3 / Ti multilayer can be achieved with complete consumption of Al. Fluid subsequent high-temperature heat treatment, TiAl_3 / Ti multilayer will eventually turn into Ti_3Al / TiAl multilayer accompanying with formation and subsequent disappearance of intermediate couples, such as TiAl_2 and Ti_2Al_5.Moreover, it is found that the growth direction of TiAl layer changes as a function of annealing time between different couples in multi-intermetallics system.