Solidification phases and liquidus surface of the Al-Ni-Ru system above 50 at.% aluminium

The Al-Ni-Ru system above 50 at.% aluminium was studied using scanning electron microscopy with energy dispersive X-ray spectroscopy, and X-ray diffraction analyses of as-cast material. The liquidus surface was deduced and the invariant reactions derived. The composition range of the ~RuNi2Al14 ternary phase was ~7-11 at.% Ru and ~70-81 at.% Al, which is wider than hitherto reported. The liquidus surface of the ~RuNi2Al14 phase was also larger than previously reported, lying between ~75 -95 at.% Al and ~2-5 at.% Ru.