What does the solvus line represent in a thermal equilibrium diagram?

The solvus line in a thermal equilibrium diagram specifically represents the boundary that indicates the maximum solubility of one metal in another at various temperatures. When examining a phase diagram, the solvus line separates regions where distinct phases exist from those where solid solutions can form. In essence, it highlights how much of metal A can dissolve in metal B before the formation of two separate solid phases occurs.

This understanding is crucial in metallurgy, particularly in alloy development where solubility affects the properties of the resulting materials. When you look at a diagram, you can see how the solvus line shifts with temperature and composition, providing vital insights into the behavior and characteristics of different alloy systems.

The other options pertain to different aspects of phase diagrams: for example, the melting points of metals are typically represented by another line, while the boundaries between different phases and temperature ranges are marked by distinct curves and lines that define various phase relationships.