Thermodynamic description of the Al–C–Ti system

• Published in: Journal of alloys and compounds Vol. 623; pp. 480 - 496
• Main Authors: Witusiewicz, V.T., Hallstedt, B., Bondar, A.A., Hecht, U., Sleptsov, S.V., Velikanova, T.Ya
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.02.2015
• Subjects: Alloys; Aluminum; Al–C–Ti; CALPHAD approach; Computer simulation; Liquidus; Mathematical analysis; Mathematical models; Phase diagram; Phase transformations; Solidus; Thermodynamic description; Thermodynamics; Thermodynamic description; Phase diagram; CALPHAD approach; Al–C–Ti
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.10.119

[Display omitted] •Thermodynamic modelling of the complete Al–C–Ti system.•Optimization and calculations of phase equilibria and thermodynamic properties.•The system is host to three ternary intermetallic phases Ti3AlC, Ti2AlC and Ti3AlC2. Based on novel experimental data the thermodynamic description of the ternary Al–C–Ti system was subject to optimization using the CALPHAD approach (Thermo-Calc/PARROT). The reaction scheme, the projections of the liquidus and solidus surfaces, as well as a number of isothermal sections and isopleths were calculated using the proposed thermodynamic description and compared with the experimental results. The calculations were shown to adequately reproduce the experimental data. The main feature of the phase equilibria in the system is the existence of three ternary compounds P (Ti3AlC), H (Ti2AlC) and N (Ti3AlC2) forming peritectically from the liquid phase and TiC1−x carbide at 1907, 1865 and 2013K, respectively. It is shown that these three compounds are thermodynamically stable in a wide temperature interval.