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SE2 Homework 15
1. The phase diagram of pure iron is shown below. Describe, when the pressure is 10-4
atmosphere pressure, as temperature decreases from 2000 oC to 500 oC, at what
temperature what phase transformation would happen.
2. Consider an alloy containing 70% Ni and 30% Cu. Its phase diagram is shown below.
(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 microstructures at these two temperatures.
3. Consider the binary peritectic iridium-osmium phase diagram below. Make phase
analyses of a 70 wt % Ir–30 wt % Os at the temperatures (a) 2600°C, (b) 2665C + T ,
and (c) 2665C - T . In the phase analyses include: (i) The phases present (ii) The
chemical compositions of the phases (iii) The amount of each phase.
Liquid (L)