Phase equilibria of the Ni-Cr-Si ternary system at 1000 and 1100 °C have been experimentally investigated by means of electron probe microanalyzer (EPMA) and x-ray diffraction (XRD) analysis on the equilibrated alloys. In the present work, the existence of the ternary compounds of σ (Cr 13Ni5Si2), π (Cr3Ni 5Si2), τ1 (Cr2Ni2Si) and τ2 (Cr3Ni3Si4), at both 1000 and 1100 °C is confirmed. The binary γ (Ni31Si 12), δ (Ni2Si), and CrSi phases exhibit a considerable solubility of a third element. Additionally, a liquid phase region is found at 1100 °C in the ranges of 15.5- 21.3 at.% Cr and 22.1-25.1 at.% Si.
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