(1) How many triple points are there in the pure iron pressure-temperature equilibrium phase
diagram? What phases are in equilibrium at each of the triple points? [10 Points]
(2) Consider an alloy containing 70 wt % Ni and 30 wt % Cu
(a) At 1350°C make a phase analysis assuming equilibrium conditions. In the phase analysis
include the following:
(i) What phases are present?
(ii) What is the chemical composition of each phase?
(iii) What amount of each phase is present?
(b) Make a similar phase analysis at 1500°C.
(c) Sketch the microstructure of the alloy at each of these temperatures by using circular
microscopic fields.
(3)
