Melting Behaviour of (Ti, Mo)C–Ni and (Ti, W)C–Ni alloys

The melting behaviour of alloys from Ni-rich portions of the quaternary systems Ni–Ti–Mo–C and Ni–Ti–W–C, where the monocarbide phases δ-(Ti, Mo)C and δ-(Ti, W)C coexist with metal melts, was investigated by means of differential thermal analysis (DTA), metallography, X- ray diffraction and SEM/EDS microanalysis. In a first approximation, the systems can be treated as pseudo-ternary with the components Ni–TiC–MoC and Ni–TiC–WC in the compositional range studied. Pseudo-ternary eutectic reactions: melt ⇔ Ni + δ-(Ti, Me)C + C (Me = Mo or W) have been observed and graphite can be in equilibrium with Ni , δ-(Ti, Me) C and melt.