Abstract
Isothermal sections of the Al-Zn-Fe-Ti quaternary system at 600 °C with Al being fixed at 75 and 50 at.%, respectively, have been determined experimentally by means of scanning electron microscopy coupled with energy dispersive x-ray spectroscopy and x-ray powder diffraction. Two four-phase regions and nine four-phase regions have been identified in the 75 at.% Al and 50 at.% Al sections, respectively. Two Al-Fe-Ti ternary phases τ2 (Al2FeTi; D8a, Mn23Th6-type cubic), τ3 (Al8FeTi3; L12, AuCu3-type cubic) and one Zn-Fe-Ti ternary phase T have been found in 50 at.% Al section. The XRD analysis of Al50Zn25Ti25 indicates it is not a true ternary compound but the extension of TiZn3. The Ti2Al5 phase which exists at temperature above 1150 °C in Ti-Al binary system is also found in the two isothermal sections.
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