Phase equilibria of the Sn-V system and interfacial reactions in Sn/V couples

Sn-V alloys were prepared for a phase equilibrium study at 600 degrees C and 250 degrees C. All alloys were annealed for longer than 6 months to ensure that they reached equilibrium. There are two intermetallic compounds, namely VSn2 (V2Sn3) and V3Sn phases. The composition of the VSn2 phase is Sn-34.0at.%V. The VSn2 phase has the CuMg2 structure. It was previously designated as the V2Sn3 phase and was renamed in this study to be consistent with its structure and composition. The composition of the V3Sn phase is Sn-78.0at.%V, and it has the A15 structure at 600 degrees C and 250 degrees C. With the new experimental results, the Sn-V system has been thermodynamically assessed with the CALPHAD approach. The calculated Sn-V phase diagram is in good agreement with the experimental determinations. Sn/V interfacial reactions at 950 degrees C and 600 degrees C are also examined in this study. The V3Sn phase is formed at 950 degrees C, while the VSn2(V2Sn3) phase is formed at 600 degrees C.