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· Above 1315 C, the system is
a liquid of uniform composition: Cu - 50 weight% Ni. (dT/dt) is determined
by heat loss to the surroundings.
· At
1315 C the isotherm cuts the liquidus
curve at the alloy composition.
Two phases are in stable equilibrium, liquid with the alloy composition, and
first solid of composition Cu - 67 weight % Ni.
· At
1250 C the isotherm cuts the solidus
line at the alloy composition.
The solid has the alloy composition and the last liquid the composition
Cu -32 weight % Ni.
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