Microstructure and Mechanical Properties of Ti/Intermetallics Layered Composites Produced by Pulsed Current Hot Pressing (PCHP)

Abstract

A pulsed current hot pressing (PCHP) technique was used to fabricate Ti/intermetallics layered composites, in which a combustion synthesis reaction was initiated at the interface between Ti and Al foils, resulting in the formation of multi-layered aluminides between Ti foils and the aluminides were densified and bonded to the Ti layers. Microstructure of the composite fabricated was an alternatively-laminated structure composed of Ti and layered aluminides, and the layered aluminides was composed of four layers : Al_3Ti, Al-rich, TiAl and Ti_3Al layers. The tensile strength and the elongation of the composite attained about 700MPa and 3.5%, respectively.