Define the term solvus with reference to thermal equilibrium diagrams. - Leaving Cert Engineering - Question (i) - 2007

The term 'solvus' refers to a specific line on thermal equilibrium diagrams, particularly in alloy systems. This line defines the limit of solubility of one metal in another within the alloy. Essentially, it dictates the amount of one metal that can dissolve in the second metal of the alloy at a given temperature. The solvus line separates the regions of the diagram that indicate where a solid solution exists from those where the two metals exist as separate phases.