Figure 2 shows the phase diagram of Pb-Sn alloy system. Answering the following

Question

Figure 2 shows the phase diagram of Pb-Sn alloy system. Answering the following questions For a 40% Sn-60% Pb alloy at 150 degree C. what are phases present. For a 40% Sn-60% Pb alloy at 150 degree C. what is composition for phases present For a 40% Sn-60% Pb alloy at 150 degree C, what is mass fraction for each phase. For a 30% Sn-70% Pb alloy, make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperature: 300T. 200 degree C. 100 degree C. For a 30% Sn-70% Pb alloy at 100 degree C. determine the mass fraction of primary a and eutectic microconstituents.

Explanation / Answer

1. For a 40%-60% Sn-Pb composition you should position yourself on the 40 marked in the horizontal axis of the graph. Then up until 150º.

Such point in the graph is not high enough to leave the solid state of both components. There is a mixture of Sn-Pb, both in solid phase.

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