Abstract
The TiAl matrix composites reinforced with Ti2AlC particles have been successfully fabricated utilizing the method of hot press consolidation followed by isothermal forging. Microstructures and tensile properties of as-sintered and as-forged conditions were investigated. The results show that the as-sintered composites consist of γ-TiAl, α2-Ti3Al and Ti2AlC phases. Microstructure analysis indicates that the products exhibit inhomogeneous microstructure and the Ti2AlC particles tend to disperse on the grain boundaries. A fine-grain and homogenous microstructure was obtained through isothermal forging. The tensile property of as-forged composites was improved simultaneously, with elongation (δ) increasing from 12.10% to 30.87%. In particular, at 1000°C, the engineering strain was up to 176%, exhibiting superplasticity.
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