Experimental investigation of phase equilibria in Ge-Ni-Ti system

Phase relations in the Ge-Ni-Ti ternary system have been studied through alloy sampling assisted with electron probe microanalysis (EPMA), and X-ray diffraction (XRD) techniques. The binary phase GeTi3 was confirmed to exist stably at 973 K and two new ternary phases, τ1 and τ2, were detected, of which only τ1 can be stable up to 1073 K. In light of the characterized phases in the annealed alloys, isothermal sections of the Ge-Ni-Ti system were constructed, which consist of 22 and 21 three-phase regions at 973 and 1073 K, respectively. In addition, Ti can substitute for about 14 at.% Ge in β(Ge,Ti)Ni3.