a) At what temperature does the first liquid phase form? a) At what temperature does the first liquid phase form? b) What is the composition of this liquid phase (first

liquid phase form)? c) At what temperature does complete melting of the alloy occur? d) What is the composition of the last solid remaining prior to complete melting? A copper-nickel alloy of composition 80 wt % Ni – 20 wt % Cu is slowly heated from a temperature of 1100 °C.