Abstract
The microstructure and mechanical properties of discontinuously reinforced Ti/TiB and Ti/(TiB + TiC) based composite materials fabricated in situ by casting were studied. High temperature α+β and near-α titanium alloys were taken as matrix materials. The composites in as-cast conditions contained randomly oriented TiB whiskers or TiB whiskers and TiC particles. Different hot forging procedures followed by heat treatment providing most creep resistant matrix conditions were applied. The produced composite materials based on Ti/TiB demonstrated appreciably higher yield stress and creep resistance in comparison with those of the matrix alloy, while retaining quite reasonable ductility. For the composite materials based on Ti/TiB and Ti/TiB + TiC, the load-bearing capacity of the TiB whiskers mainly contributed to the enhancement of strength and creep resistance, whereas the role of TiC particles was found to be negligible. At the same time, the reinforcement with TiC particles strongly reduced the room temperature ductility.
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