2000 Volume 40 Issue Suppl Pages S77-S81
Dense TiAl/Ti2AlC composites were produced from mixed powders of Ti, Al, and TiC by pulsed-electric current sintering. The sintered products mainly consisted of TiAl and Ti2AlC phases and showed different microstructures depending on the composition. When 7vol%TiC was mixed in the starting powders, the Ti2AlC particles were uniformly dispersed in the Ti-Al matrix with the duplex structure containing γ and lamellar phases. When 15vol%TiC was used, the product was composed of an interpenetrating network of the Ti2AlC and TiAl phases. After the heat treatment, however, both microstructures changed to that of Ti2AlC particles dispersed uniformly in the matrix of a γ single phase. The fracture toughness, flexural strength, and hardness of these composites as well as the wear resistance and friction coefficient were evaluated.