Microstructure characteristic of in-situ Ti/TiC composites

TIC reinforced titanium composites has been produced with different Al cont ent and C content by XD(TM). The results have shown that TiC particles are of two different morphologies: coarse dendritical primary TiC and short bar -shape eutectic TiC. Al content has great effects on the morphology of TiC. With the increasing of Al content, the morphology of primary TiC changes f rom coarse developed dendrite into short bar-shape or plate-shape TiC with 35%Al. Meanwhile, the structure of the matrix changes from single Ti to Ti and Ti3Al, and to Ti3Al and TiAl. However, the C content has no influence o n the microstructure of matrix. When the C content is less than 1.2%, the d endrite TiC disappears and only short bar-shape or plate-shape TiC exists i n the composites. in addition, the effect of heat treatment on the morpholo gy of TiC has also studied.