Isothermal section of ternary Sn-Zn-Ni phase equilibria at 250 °C

Abstract

Ternary Sn-Zn-Ni alloys were prepared and equilibrated at 250 °C for 4-15 weeks. The phases formed in these equilibrated alloys were determined experimentally. The isothermal section of Sn-Zn-Ni system was constructed, based on the phase diagrams of the three constituent binary systems and the ternary phase equilibria data, determined in this study and referenced in literatures. 12 single-phase regions were identified in the Sn-Zn-Ni ternary system at 250 °C, including the three ternary compounds, δ, τ1 and τ2. There were 13 ternary phase regions and 23 binary phase regions in the 250 °C Sn-Zn-Ni isothermal section. The solubility of Zn in the binary Sn-Ni compounds is significant, and is 15.1% (mole fraction) in the Ni3Sn phase.