If 33 atom % Cu is mixed into a Ni crystal at a temperature of 473 K (200°C), determine the change in the GFE relative to segregated Cu and Ni for 1 mole of total atoms if the enthalpy of solution for Cu into Ni is 0.11 eV/atom, according to data in Hultgren et al.
(a) What is the GFE change for the mixing?
(b) Based upon your result, should it be possible to mix 33 atom % Cu into Ni at 473 K? Explain your answer and compare this result to the phase diagram in Figure 5.7.
(a) To determine the entropy of mixing the 33% copper into nickel for a total of one mole of atoms, the chemical composition values are inserted into the mixing entropy equation. Since the problem is on a per mole basis R replaces k in the mixing entropy equation.
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