Phase equilibria of the Zr–Ti–Si ternary system at 773 K

Abstract

a b s t r a c tThe phase equilibria of the Zr-Ti-Si ternary system at 773 K have been investigated mainly by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive analysis (EDX). The isothermal section consists of 14 single-phase regions, 23 binary-phase regions and 13 ternary-phase regions. The binary compounds Zr 3 Si and Zr 5 Si 3 are not observed at 773 K. Therefore, there are 10 binary compounds, i.e. in the Zr-Ti-Si system at 773 K. Ternary compound Si 3 Ti 2 Zr 3 is found at this isothermal section. The solubilities of Zr in TiSi 2 , TiSi, Ti 5 Si 4 , Ti 5 Si 3 and Ti 3 Si were determined to be up to 10, 11, 12, 13 and 7 at.% Zr, respectively; the solubilities of Ti in Zr 3 Si 2 , Zr 5 Si 4 , ZrSi and ZrSi 2 were about 5.4, 14, 7 and 14 at.% Ti.

Isothermal section of the Gd–Zr–Si ternary system at 773K

“…Space group Structure type Lattice parameters (nm) [8,13] and becomes to be unstable below 1473 K or above 1773 K. Our experimental results stand in good agreement with the results of these references. It was reported that Zr 5 Si 3 was metastable between the temperature of 2018 and 2353 K and decomposed below 2018 K by the eutectoid reaction Zr 5 Si 3 → Zr 3 Si 2 + Zr 2 Si [8].…”

“…It was found that, after proper heat treatment, the phase of Zr 5 Si 3 disappeared in all the binary and ternary alloys at 773 K pointing to that the phase is a high-temperature phase and absence at 773 K. This agreed well with Refs. [8,13].…”

The isothermal section of the Pr–Ti–Si ternary system at 773K

“…Recently, we reported the phase equilibria of the La-Ti-Si [1], Zr-Ti-Si [2], Nb-Ti-Si [3] and Gd-Ti-Si [4] systems by means of experimental methods.…”

Immiscible metallic melts in the upper mantle beneath Mount Carmel, Israel: Silicides, phosphides, and carbides

“…These temperatures also probably represent maximum estimates, and would be lowered by solid solution of Si, Fe and H. The spread of points in clusters 23 and 24 represents extensive solid solution approximately along the TiSi 2 -ZrSi 2 join. An isothermal section of this ternary at 500 °C (Zhan et al, 2009) shows ca 10% solid solution along this join from each end member; the present data suggest higher temperatures, but with no real constraints. The phase represented by analysis #25 in Table 1 is consistent with a eutectic melt (T ca 1300 °C) which would be crystallizing both Si (observed as inclusions in SiC) and a (Ti, Zr)Si 2 phase.…”