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Phase relationships involving TiC and Ti3AlC (P phase) in Ti–Al–C system

Abstract Titanium rich alloys of the Ti–Al–C system have been investigated to determine the constitution in the range 1250–750°C with particular reference to phase equilibria and transformations involving TiC and Ti3AlC (P phase). Alloys with varying aluminium and carbon concentrations up to 15 at.-%Al and 15 at.-%C have been studied using scanning and transmission electron microscopy and X-ray diffraction. The isothermal sections at 1250, 1050, 1000, and 750°C reported by previous workers are reviewed. Equilibria involving the phases β-Ti, α-Ti, Ti3Al (α 2), TiC, and Ti3AlC (P phase) have been investigated and partial isothermal sections at 1050 and 750°C are presented. A revision of the previously established Ti–Al–C isothermal section at 750°C is shown involving equilibria of α+α 2+P and α+P+TiC. The orientation relationship between the P phase and Ti–Al (α/α 2) matrix has been found to be (0001)α/α 2 ∥{111}P and 〈12¯10〉α/α 2 ∥〈110〉P.