Liquidus Line

The liquidus line is a boundary on a phase diagram that indicates the temperature above which a material is completely liquid. Below this line, the material begins to solidify, with some liquid still present until it reaches the solidus line. It helps visualize the temperatures at which a substance changes from liquid to solid during cooling or vice versa during heating. Essentially, the liquidus line marks the start of solid formation as temperature decreases, and understanding it is crucial in processes like metal casting and alloy manufacturing to control the material's structure and properties.