Liquidus and solidus lines

The liquidus and solidus lines are boundaries on a phase diagram that show how metals or alloys change as they cool. The liquidus line marks the temperature where a fully melted substance begins to solidify, meaning crystals start forming. The solidus line indicates the temperature where the material becomes completely solid. Between these lines lies a mix of solid and liquid phases, called the mushy zone. Understanding these lines helps predict how a material will behave during cooling, which is essential for controlling its properties in manufacturing and metallurgical processes.