The Cr-Ni-Zr (Chromium-Nickel-Zirconium) System

The chromium-nickel-zirconium (Cr-Ni-Zr) system for the development of high temperature resistant brazing material was studied. The Cr-Zr system showed the presence of only one intermediate phase Cr 2Zr which occurred in three polymorphic forms, the αCr 2Zr(ψ 1) existed below ~1592 °C, the βCr 2Zr(ψ 1) existed between 1592 and 1622 °C, and the δCr 2Zr(δ 1) existed between 1622 and 1673 °C. The Ni-Zr system had eight intermediate phases that included Ni 5Zr, Ni 7Zr 2, Ni 3Zr, Ni 21Zr 7, Ni 10Zr 7, Ni 11Zr 9, NiZr, and NiZr 2). Metallography, x-ray diffraction (XRD), and thermal analysis were used for characterization of the alloys. The three phase equilibrium solidus temperature for the two alloys was found to be 1220 °C, which indicated the existence of a ternary eutectic reaction.