Gi Consider The Lead Magnesium Phase Diagram Shown In Figure 1 Composition At Pb 10 20 30 40 700 600 500 400 300 200 1 (27.5 KiB) Viewed 18 times
Gi Consider The Lead Magnesium Phase Diagram Shown In Figure 1 Composition At Pb 10 20 30 40 700 600 500 400 300 200 2 (23.79 KiB) Viewed 18 times
Ġi Consider the lead-magnesium phase diagram shown in Figure 1. Composition (at% Pb) 10 20 30 40 700 600 500 400 300 200 100 0 (Mg) Temperature (°C) T I T a a + L L a + Mg₂Pb L Mg₂Pb M Mg₂Pb 20 40 60 80 Composition (wt% Pb) Figure 1: Lead-magnesium phase diagram L Mg₂Pb 70 100 B B Mg₂Pb 846 T X ET 1 1200 1000 800 600 400 200 100 (Pb) Temperature (°F)
d) Sketch the cooling curve you would expect to get if you allowed the alloy containing 50 wt% Pb and 50 wt% Mg to cool from 700°C to 50°C. Mark on it any temperatures you are certain of. (3 Marks) e) Explain what is happening at each stage of the cooling curve you plotted in (d). (4 Marks) f) Calculate the composition required if a Pb-Mg alloy is to contain equal proportions of primary a and eutectic (a + Mg₂Pb). (4 Marks)
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