Question

For a lead-tin alloy of composition Pb-30 wt.% Sn are heated to 300°C and slowly cooling down to room temperature. A Eutectic phase diagram of lead-tin alloy is shown in figure 3. What are the expected phases at 250°C, 150°C and at room temperature and estimate approximate phase fractions at these temperatures. Schematically draw the microstructures that would form at 250°C, 150°C and at room temperature.

For a lead-tin alloy of composition Pb-30 wt.% Sn are heated to 300°C and slowly cooling down to room temperature. A Eutectic phase diagram of lead-tin alloy is shown in figure 3. What are the expected phases at 250°C, 150°C and at room temperature and estimate approximate phase fractions at these temperatures. Schematically draw the microstructures that would form at 250°C, 150°C and at room temperature.

For a lead-tin alloy of composition Pb-30 wt.% Sn are heated to 300°C and slowly cooling down to room temperature. A Eutectic phase diagram of lead-tin alloy is shown in figure 3. What are the expected phases at 250°C, 150°C and at room temperature and estimate approximate phase fractions at these temperatures. Schematically draw the microstructures that would form at 250°C, 150°C and at room temperature.

Answer 1

red pb - 30 wt% sn T= 300 C T= 250C T = 1566 phases 2 L 250°C 150c 2 B 258c Composition. 150C 14 wt %.sn 2 -10wt%sn 33 wt) sn 13 - 98wt%sn a L 2 L 2 30 98 10 30 33' 14 33-30 -0.15789 Wa 98-30 -0.7727 98-10 11 We 33-14 30-14 0-227 kl 30-10 98-10 = -0.8421 33-14 Wi B o ß I e Iliquid -plaa ₂2 y proeutectica, 2586 150c