For a lead-tin alloy of composition 25 wt% Sn-75 wt% Pb, select from the following list the phase(s) present and their composition(s) at 200°C.

A. α = 17 wt% Sn-83 wt% Pb; L = 55.7 wt% Sn-44.3 wt% Pb
B. α = 25 wt% Sn-75 wt% Pb; L = 25 wt% Sn-75 wt% Pb
C. α = 17 wt% Sn-83 wt% Pb; α' = 55.7 wt% Sn-44.3 wt% Pb
D. α = 18.3 wt% Sn-81.7 wt% Pb; α' = 97.8 wt% Sn-2.2 wt% Pb

Question

04-04-2024
Engineering

College

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For a lead-tin alloy of composition 25 wt% Sn-75 wt% Pb, select from the following list the phase(s) present and their composition(s) at 200°C.

A. α = 17 wt% Sn-83 wt% Pb; L = 55.7 wt% Sn-44.3 wt% Pb
B. α = 25 wt% Sn-75 wt% Pb; L = 25 wt% Sn-75 wt% Pb
C. α = 17 wt% Sn-83 wt% Pb; α' = 55.7 wt% Sn-44.3 wt% Pb
D. α = 18.3 wt% Sn-81.7 wt% Pb; α' = 97.8 wt% Sn-2.2 wt% Pb

Answer :

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SNavya SNavya · Answer 1 · 2024-12-31T17:38:28-05:00

For the given lead-tin alloy it has a composition of 25 wt% Sn-75 wt% Pb.

a = 25 wt% Sn-75 wt% Pb; L = 25 wt% Sn - 75 wt%Pb is the correct phase(s) present and their composition(s) at 200 °C.

The correct answer is the option: b. a = 25 wt% Sn-75 wt% Pb; L = 25 wt% Sn - 75 wt%Pb

Lead-tin alloy, also known as solder, is a metallic alloy composed primarily of lead (Pb) and tin (Sn). It is widely used in various industries, particularly in electronics and plumbing, for its desirable properties and ability to join or bond metal components together.

At 200°C, the given alloy has a composition of 25 wt% Sn-75 wt% Pb. The phase diagram for Pb-Sn alloy system at 200°C shows that at this temperature, the alpha phase and liquid phase are present.From the phase diagram, we can see that the alpha phase exists between 0 wt% Sn- 37 wt% Sn composition range whereas the liquid phase exists between 37 wt% Sn-100 wt% Sn composition range.Therefore, at 200°C, the phase present in the given alloy is the alpha phase having a composition of 25 wt% Sn-75 wt% Pb and the liquid phase having a composition of 25 wt% Sn-75 wt% Pb.The correct option is b. a = 25 wt% Sn-75 wt% Pb; L = 25 wt% Sn - 75 wt%Pb.

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