The ultrafine structure of the TiB-whisker reinforced Ti alloy matrix composite was studied by means of high-resolution electron microscopy (HREM). The TiB whiskers were embedded in the Ti alloy matrix uniformly. The whiskers were in the form of elongated needles with a roughly hexagonal cross section. The aspect ratio of TiB of about 20 or higher can be achieved after hot extrusion. The TiB whiskers contain a moderate number of stacking faults on the (100)TiB plane. The Ti alloy matrix consists of alpha-Ti and beta-Ti. A superstructure in beta-Ti was determined. Orientation relationships and atomic structure of the TiB/Ti interfaces were studied using HREM. The TiB whiskers bond well to the Ti alloy matrix and the TiB/Ti interfaces are atomically flat, sharp and free from any interfacial phase.
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