1. Considering the Cu-Ag phase diagram in Figure 1- what are the melting temperatures of Cu and Ag? Define the Eutectic point of the CU-Ag alloy in terms of % composition and temperature. (4 marks) 2. Sketch and label the grain structure of a 10% Ag, 90% Cu alloy at room temperature? IE what phases would you see under the microscope and what would they look like. (3 marks) 3. Using Figure 1, determine the liquid and solid phase composition for a 60% Cu, 40 % Ag alloy at 850°C. Also determine the proportions of liquid and solid phases present in the alloy. (8 marks) 4. Using Figure 2, what is the melting temperature (°C) of a 10100 steel? (1 mark) 5. To what minimum temperature (°C) should 1045 steel be heated to enter the austenite range? (1 marks) 6. What phase(s) are present in an iron-carbon alloy that has 3.25% carbon at a temperature of 1025°C? What is the name of this metal? (2 marks) 7. Sketch and label the grain structure typical of a room temperature hypo-eutectoid steel as seen under the microscope. (3 marks) 8. Using the TTT diagrams shown in Figures 3 and 4, determine the grain structure that is present when a 100% austenitic structure at 750°C is: a. Cooled rapidly to 400°C, held for 2 s, then quenched to room temperature. b. Cooled rapidly to 400°C, held for 20 s, then quenched to room temperature. c. Cooled rapidly to 700°C, held for 10,000 s, then quenched to room temperature. a. Cooled rapidly to 600°C, held for 100,000s, then Atomic percent carbon 15 Temperature, "C 1600 1400 ° +liquid 3 10 15 1200 +-liquid 1000 800 912 Eutectoid temperature Austenite Austenite 3 100 -My- Temperature (°C) 800 600 400 C 6.0 Solvun Liquid 1148° 2.11 4.3 Pearlite 500 1+carbide vide 727 (1340°F) 6 800 Pearlite + Bainite I reent carbon narks) 108 Time in seconds Bainite 279Cre 71.9 23 Fe 80 100 2200 2000 1800 F 1600 912 1400 2000 20 40 60 80 100 Dul Composition (wt% Agl 2 Figure 1: Binary Phase Diagram for Cu-Ag Alloy. (Ref, OSU website) 1200 1000 800 600 Figure 2: Iron - Carbon Phase diagram (Ref, old notes) Figure 3: TTT diagram for 1080 Steel (Ref, OSU website) Figure 4: TTT diagram for Steel/Ref VT website)