(2) Using the following Mg-Pb phase diagram, make schematic sketches of the microstructures that would be observed for the alloy 10 wt% Pb-90 wt% Mg, 50 wt% Pb-50 wt% and 90 wt% Pb-10 wt% Mg at 500 and 200°C. Label all phases in your sketches and determine the composition and amount of each phase present. (60 points) Composition (at% Pb) 0 10 20 30 40 70 100 Temperature (°C) 700 600 500 400 300 200 100 wt% Pbi 0 (Mg) a a +L L 1200 L ME Pb M 87 wt% Pb 1000 800 35 wt% Pb 62 wt% Pb B L + L Mg-Pb 600 20 40 Mg,Pb 60 Composition (wt% Pb) 400 K 99 wt% Pb 81 wt% Pb Mg2Pb B+ Mg Pb 200 80 100 (Pb) Temperature (°F) ANSWERS for 2 (a) - Composition 10 wt% Pb - 90 wt% Mg a) Microstructures - Draw microstructures in the circles below. 500 °C 200 °C (NAME) а b) Composition of Phase Present - Expressed in terms of w% Pb 500 °C 200°C L Phase a Phase Mg2Pb Phase ẞ Phase c) Amount of Each Phase Composition Present - Expressed as weight % of 100% Calculations 500 °C L Phase a Phase Mg2Pb Phase ẞ Phase 500 °C 200 °C Calculations 200 °C ANSWERS for 2 (a) - Composition 50 wt% Pb - 50 wt% Mg a) Microstructures - Draw microstructures in the circles below. 500 °C 200 °C (NAME) b) Composition of Phase Present-Expressed in terms of w% Pb 500 °C 200 °C L Phase a Phase Mg2Pb Phase ẞ Phase c) Amount of Each Phase Composition Present-Expressed as weight % of 100% Calculations 500 °C L Phase a Phase Mg2Pb Phase ẞ Phase 500 °C 200 °C Calculations 200 °C ANSWERS for 2 (a) - Composition 90 wt% Pb -10 wt% Mg a) Microstructures - Draw microstructures in the circles below. 500 °C 200 °C (NAME) b) Composition of Phase Present - Expressed in terms of w% Pb 500 °C 200 °C L Phase a Phase Mg2Pb Phase ẞ Phase c) Amount of Each Phase Composition Present - Expressed as weight % of 100% Calculations 500 °C L Phase a Phase Mg2Pb Phase ẞ Phase 500 °C 200 °C Calculations 200 °C