Wettability and microstructures of Ni-Al/TiC x composites have been studied by measuring the wettability contact angle using the "sessile drop" method, and by observation using a scanning electron microscope (SEM) and an analytical transmission electron microscope (ATEM), together with an energy dispersive X-ray spectrometer (EDS). The equilibrium contact angle of Ni-Al alloys on TiC x (X=0.7-l) vs. Ni content showed that the wetting angle depends on the concentration of C in TiC x . The results agreed with the observation of morphology at the interfaces between the hard phase skeleton of TiC x (x= 0.7, 0.9) and metallic phases. The concentration distance plot for Ti, and Ni across the interface of Ni 3 Al/ TiC 0 . 7 showed that an extensive area of intermetallic compounds can be observed at the Ni 3 Al / TiC 07 interface. The microstructure analysis suggested that Ti in TiCo i is easier to dissolve into the molten alloy than that in TiC 09 . Some periodic zigzag fringes were also observed in the interface between metallic phase and carbides in the sample of Ni 3 Al /TiC 0 . 7 The formation of this periodic zigzag fringe, which may be a growth zone of a new Ti-Ni-AI phase, would occur during the initial stage of solidification in the samples obtained by infiltration. This behavior in the interface of Ni-Al/TiC x composite would affect their strength, creep resistance at elevated temperatures and lowtemperature toughness.