The Isothermal Section Of The Gd-Mn-Ti Ternary System At 773K

The isothermal section of the phase diagram of the Gd-Mn-Ti ternary system at 773K has been investigated mainly by X-ray powder diffraction with the aid of differential thermal analysis and metallography. The 773K isothermal section consists of eleven single-phase regions, nineteen two-phase regions and nine three-phase regions.The eleven single-phase regions are: A(Gd) , B(Mn) , C(Ti) , D(GdMn₂) , E(Gd₆Mn₂₃) , F(GdMn₁₂) , G(Mn₅Ti) , H(Mn₂Ti) , I(Mn_0.52Ti_0.48), J(MnTi) and K(Mn₁₅Ti₈₅).The 19 two-phase regions are: A+C, A+D, A+H, A+I, A+J, A+K, D+H, D+E, E+F, E+B, E+G, E+H, F+B, B+G, G+H, H+I, I+J, J+K and K+C.The 9 three-phase regions are: A+D+H, A+H+I, A+I+J, A+J+K, A+K+C, D+E+H, E+F+B, E+B+G and E+G+H.At 773K, the maximum solid solubility of Ti in Mn, GdMn₁₂,Gd₆Mn₂₃ and GdMn₂ are about 8at%, 2at%, 3at% and 3at% Ti, respectively. The homogeneity range of Mn₂Ti extends from about 61at% to 69at% Mn. No ternary compounds were observed in this work.