In situ fabrication of TiC/Ti3Al/Ti2AlC composite by spark plasma sintering technology

A powder mixture of Ti, Al 4 C 3 and graphite was adopted to synthesize a new TiC/Ti 3 Al/Ti 2 AlC composite by spark plasma sintering. The reaction route was proposed from XRD analysis. TiC, Ti 3 Al and Ti 2 AlC formed from 800°C with TiC x and Ti 3 Al y acting as the intermediate phases until the reaction process completed at 1200°C. It was found from TEM observation that Ti 3 Al underwent an intergrowth relationship with TiC grains inside the Ti 2 AlC matrix due to the in situ reaction sintering. The average hardness, fracture toughness, Young's modulus and bending strength of the composite were 10.2 ± 0.6 GPa, 6.5 ± 0.2 MPa·m 1/2 , 436 ± 11 MPa and 227 ± 13 GPa, respectively.

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