6. Answer the following questions regarding the Lever Rule. [ a. Describe the purpose of the Lever Rule and write the equation. b. Using the lever rule for 52 wt% Zn-48 wt% Cu, cite the phases present and mass fractions at the following temperatures: 1000°C, 800°C, 500°C, and 300°C. Refer to the Cu-Zn diagram from problem 3 or use the book diagram on p. 326. 7. Returning to the Zn-Cu phase diagram, using the composition 52 wt% Zn-48 wt% Cu, draw schematics of the microstructures if you were to undergo a slow cooling process. Draw representations for 950°C, 860°C, 800°C, and 600°C. Make sure to properly label each phase and determine their approximate compositions. 70-30 brass 60-40 brass 1083 C 1000 .902°C Liquid ww. ww. www. 834°C 800 700°C ఇ Solid a ! or (Ču) 8 698C 600 3. 424PC 400 419°C Solid or (Zn) 200 20 40 60 100 Cu wt % Zn Zn Temperature, T (°C) 80

If 20000 g of steam is condensed in 2 x 10^6 cm³ at a pressure of 4 MPa a. What is the temperature (C)? b. In what state steam? c. Draw it in the form of a phase diagram that you know

According to the following graph, two samples of 1080 steel are cooled from the eutectoid temperature, one at a cooling rate of 250°C/s and the other at a cooling rate of 7.27x10-8 °C/s. Specify the phases obtained and explain their formation from thermodynamic and kinetic perspectives. Also, briefly describe their formation. Draw the microstructure of the phases obtained. Sıcaklık (C) 800 700 600 500 400 300 200 100 0 10 1 T M(başlama) M(% 50) M(% 90) 10 M+O -Otektoid Sıcaklık 10² Zaman (s) % 50 10³ 104 105

1200 50% Ag 71.9% Ag 1100 1000 900 100% Cu Temperature (°C) 800 8% Ag\ 20% Ag 700 Time 100% Ag 90% Ag Figure V Cooling curves for a series of Cu-Ag alloys. 11. Cooling curves are obtained for a series of Cu- Ag alloys. Use the data in Figure 4 to produce the Cu-Ag phase diagram. The maximum solubility of Ag in Cu is 7.9% and the maximum solubility of Cu in Ag is 8.8%. The solubilities at room temperature are near zero.