No abstract

The Al-Fe-Ti system has been assessed and the limiting binary systems are shortly reviewed.Based on a thorough review of the literature, isotherms at 800, 900, and 1000 °C have been re-evaluated and a provisional isotherm at 1200 °C is presented for the first time. The effect of alloying the binary phases with the third component is reviewed with regard to the ternary homogeneity ranges, crystallography, order/disorder transformations, and site occupancies. Of the variously reported ternary compounds only the existence of "Al 2 FeTi" (τ 2 ) and "Al 8 FeTi 3 " (τ 3 ) is confirmed. The occurrence of the phases τ 2 * , τ′ 2 , and of a new stacking variant of TiAl is still under discussion, while the existence of the phases Fe 2 AlTi (τ 1 ) and Fe 25 Al 69 Ti 6 (X) is ruled out. The presented reaction scheme corroborates the isothermal sections and also a representation of the liquidus surface is given. Magnetic, electrical, thermochemical, atomistic and diffusion data for Al-Fe-Ti alloys are summarised and an overview about studies on modelling of phase equilibria and phase transformations is given.

No abstract