Micro-nanocrystalline microstructures which are characterized by TiB2 platelets of the average thickness close to or smaller than\n1 ????m can be achieved in nearly full-density solidified TiC-TiB2 ceramic composites with Cr-based alloy phases by combustion\nsynthesis in ultra-high gravity field of 2500 g. The filler phases in ceramic composites are actually Cr-based alloy with a little\nsolidified solution of Ni atoms and Al atoms. The hardness, flexural strength, and fracture toughness of the materials are 18.5 �±\n1.5 GPa, 650 �± 35MPa, and 16.5 �± 1.5MPa?m0.5, respectively. The improved fracture toughness of TiC-TiB2 ceramic composites\nresults from crack deflection, crack bridging, and pull-out by a large number of fine TiB2 platelets and plastic deformation with\nsome Cr-based alloy phases.
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