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).