The Sn–Ti–Zr system: equilibrium phases at 900°C

Sn–Ti–Zr alloys were obtained by melting pure elements in an arc furnace. The compositions of the alloys were selected in order to establish the equilibria and domains of the stable phases. Isothermal heat treatments at 900°C were made in two time intervals of 750 h, each one performed in order to reach the stable equilibria of the phases. The characterization of the phases and the determination of their compositions were made by metallographic observations, X-ray diffraction, energy dispersive spectroscopy and electron microprobe analysis. The isothermal section of the Sn–Ti–Zr system at 900°C was drawn in a Gibbs phase diagram.