A re-examination of the liquidus surface of the Al-Fe-Ti system

The liquidus surface of the Al-Fe-Ti system has been re-examined. 34 different alloys have been studied by differential thermal analysis, and the temperatures of invariant reactions have been determined. By examining the as-cast samples by optical microscopy, X-ray diffraction and energy-dispersive spectrometry in a scanning electron microscope, the crystal structures and chemical compositions of the primary phases and two-phase aggregates have been established. In some cases, additional investigations were carried out in the transmission electron microscope. From the combined results of these investigations the solidification paths of the alloys were established leading to a revised representation of the liquidus surface of the Al-Fe-Ti system. A reaction scheme has been set up which shows phase equilibria that are consistent with previous solid-state isothermal sections.