A copper-nickel alloy of composition 70 wt% Ni-30 wt% Cu is slowly heated from a temperature of 1300°C (2370°F). (a) At what temperature does the first liquid phase form? (b) What is the composition of this liquid phase? (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? (e) Explain what kind of microstructure would occur if the alloy was very rapidly cooled from 1400°C to RT. (f) How would the microstructure be different if the sample was cooled less quickly but still not slowly enough to allow a fully equilibrium microstructure? Would the alloy be safe to heat to 10 C below the solidus in this condition?
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A copper-nickel alloy of composition 70 wt% Ni-30 wt% Cu is slowly heated from a temperature of 1300...
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