Constitution of the ternary system Cr–Ni–Ti

•Reaction scheme and liquidus surface for Cr-Ni-Ti are given.•In the ternary the C14-type Laves phase coexists with the liquid phase.•Two ternary eutectics are identified.

The nature of solid–liquid phase equilibria in the ternary system Cr–Ni–Ti was investigated using electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and differential thermal analysis. Literature data on solid state phase equilibria are confirmed. The Cr2Ti Laves phase modifications coexisting with Ni–Ti phases are clarified to be hexagonal C14-type and cubic C15-type. The C14-type Laves phase γCr2Ti is found to coexist with the liquid phase. It forms in the pseudobinary peritectic reaction pmax1 from L + β(Cr,Ti) at 1389 °C. On further cooling γCr2Ti + NiTi solidify at 1202 °C in the pseudobinary eutectic emax2. In the Cr-rich part of the system ternary eutectics occur at 1216 °C (E1: L = Ni3Ti + (Ni) + β(Cr,Ti)) and 1100 °C (E2: L = NiTi + Ni3Ti + β(Cr,Ti)), respectively. No ternary eutectic is found in the Ti-rich part. Rather the eutectic trough ends in the binary eutectic L = NiTi2 + β(Ti).