a) The system A-B has two components, one congruent and containing 30% B and the other incongruent and containing about 60% B. The addition of B to A lowers the temperature of initial freezing, whereas the addition of A to B increases the temperature of initial freezing. All solid phases exist over a limited range of compositions and three invariant transformations occur in the system. Construct the diagram and label the phase fields. (8 Marks) b) A Cu-Zn phase diagram is given Figure 1. There are some errors in the dashed lines region. 1. What are these errors? (3 Marks) 2. Correct these errors and draw the region correctly. (5 Marks) at% Zn 70 80 90 10 20 30 40 50 60 100 °C 1100 1000 Liquid 900 -902 834 800 700° 700 B 18 600 600 7 560) 500 460° 1454 423° E 400 SI 300 200 0 10 20 30 40 60 70 80 90 100 50 wt% Zn Cu-Zn Figure 1 Cu-Zn phase diagram a) The system A-B has two components, one congruent and containing 30% B and the other incongruent and containing about 60% B. The addition of B to A lowers the temperature of initial freezing, whereas the addition of A to B increases the temperature of initial freezing. All solid phases exist over a limited range of compositions and three invariant transformations occur in the system. Construct the diagram and label the phase fields. b) A Cu-Zn phase diagram is given Figure 1. There are some errors in the dashed lines region. 1. What are these errors? 2. Correct these errors and draw the region correctly. at% Zn 70 80 90 10 20 30 40 50 60 100 °C 1100 1000 Liquid 900 -902 834 800 700° 700 B 18 600 600 7 560) 500 460° 1454 423° E 400 SI 300 200 0 10 20 30 40 60 70 80 90 100 50 wt% Zn Cu-Zn Figure 1 Cu-Zn phase diagram
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