Phase equilibria of the Co–Ni–Zr system at 1198 K

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The isothermal section of the phase diagram of the Co–Ni–Zr ternary system at 1198 K has been investigated by means of diffusion triple and electron microprobe analysis. This isothermal section consists of six three-phase regions. The homogeneity ranges of Co 23Zr 6, Co 2Zr, CoZr, Ni 5Zr, Ni 7Zr 2 and NiZr are about 16.7%–18.8 at.%Zr, 28.6%–32.3 at.%Zr, 49.2%–51.7 at.%Zr, 16.0%–18.7 at.%Zr, 22.3%–24.1 at.%Zr and 49.8%–52.1 at.%Zr, respectively; CoZr 2 and NiZr 2 are nearly linear compounds. The largest solubilities of Ni in Co 23Zr 6, Co 2Zr and CoZr are about 4.9 at.%Ni, 5.4 at.%Ni and 4.5 at.%Ni, respectively. CoZr 2 and NiZr 2 form a continuous solid solution (Co,Ni)Zr 2. No ternary compound is observed.