Equilibrium of Mg-O and the Effect of Fe,Al and Cr on the Activity of Mg in Molten Nickel

The equilibrium constant of Mg-O in Nickel melt at the temperature range of 1 480℃ to 1580℃ was determined with the vapour equilibrium method in a sealed chamber. The influence of the alloying elements Fe, Al and Cr on the activity of Mg in nickel melts at 1480℃ mas investigated. It was found that at 1480℃ to 1580℃: \log K_\rmMgO = 0.50 + 1.27 \times 10^4/T;G_\rmMgO^\rmo = 2.43 \times 10^5 - 9.57T(\rmJ/mol);e_\rmMg^\rmO = 1.10 \times 10^3 - 2.19 \times 10^6/T; And at 1480℃: e_\rmMg^\rmFe = - 0.28;e_\rmMg^\rmAl = - 0.51;e_\rmMg^\rmCr = 0.72