Experimental Determination of Isothermal Sections in the Ni-Cr-W Ternary System at 1100 and 1200°C

Abstract

The 1100 and 1200°C isothermal sections of the Ni-Cr-W ternary system were experimentally determined. Twenty-one alloys with multiphase compositions were equilibrated at 1 100 and 1 200°C for more than 5 000 and 100 h, respectively. Three terminal solid solutions : fcc γ nickel-rich, bcc α₁ chromium-rich and bcc α₂ tungsten-rich phases, and one intermetallic compound : σ phase, were observed as stable phases. Two-phase tie-lines and three-phase tie-triangles were determined by means of electron probe microanalysis.