Experimental Investigations of the Isothermal Sections for the Ni-Si-Zr Ternary System at 1023 and 1173 K

Phase equilibria in the Ni-Si-Zr ternary system have been investigated experimentally by means of x-ray diffraction and electron probe micro-analyzer on equilibrated ternary alloys. Four ternary phases were detected at 1023 and 1173 K. The Ni 16 Si 7 Zr 6 phase tends to present in two different contrasts and has a wide homogeneity range. The reported Ni 2 Si 9 Zr 14 phase is not detected in this work. It is proposed that the Ni 2 Si 9 Zr 14 phase is unstable at these temperatures. As for the binary phases, Ni 5 Zr and Ni 7 Zr 2 dissolve appreciable amounts of Si and γNi 31 Si 12 , βNi 3 Si, δ Ni 2 Si, NiSi 2 exhibit a considerable solubility of Zr.