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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.

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OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible.

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Understanding and control of short term precipitation of delta phase in Inconel 718 alloy is of importance as it is used to control grain growth during forging. This precipitation has been studied on both as received and solution treated 718 alloy, in the temperature range 650 to 1020uC and for times up to 10 h. The outer envelope of the transformation -time -temperature (TTT) diagram, which indicates the time at which the delta phase first precipitates during isothermal holding at a given temperature, has been drawn and compared to a critical review of previous information. Precipitation kinetics are also reported for both materials and discussed in the light of the very scarce data available in the open literature. According to these results, the so called 'nose' of the TTT diagram is located at a higher temperature and lower time than predicted from previously published diagrams. MST/6118