Given the following phase diagram answer questions 1- 5? Melting point of Pb-10%

Question

Given the following phase diagram answer questions 1- 5? Melting point of Pb-10%Sn is About 280 degree C 310 degree C 400 degree C 120 degree C Maximum solubility of Pb in Sn in solid solution is 19%Pb 2.5%Pb infinity None of the above Sn content of alpha-phase at 200 degree C In an alloy of Pb-10% Sn is 90% 10% 19% None of the above Eutectoid reaction in Pb-Sn system takes place at 19% Sn 61.9% Sn 97.5%Sn None of the above Eutectic composition in Pb-Sn system provides an alloy with Maximum ductility Maximum elongation Maximum reduction in Area Maximum strength

Explanation / Answer

1. B- From the figure, the liquidous phase begins at 310 degrees for Pb-10% Sn.

2. A- Maximum solubility occurs at 19% Pb.

3. C- At 200 degrees, Sn content of alpha phase is 19%

4. B- Eutectoid reaction is a phase where 1 solid phase splits into 2 Solid phases, from the figure it occurs at 61.9% Sn.

5. D- Maximum strength- Tensile strength increses with an increase in Sn content. Hence, eutectic composition provides an alloy with maximum strength.

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