For an alloy of composition 25 wt% Sn - 75 wt% Pb, select the phase(s) present a

Question

For an alloy of composition 25 wt% Sn - 75 wt% Pb, select the phase(s) present and their composition(s) for each of the temperatures cited.

T(1) = 300 Celsius:

a) L = 90.0 wt% Sn - 10.0 wt% Pb;
   a = 10.0 wt% Sn - 90.0 wt % Pb

b)   L = 25.0 wt% Sn - 75.0 wt% Pb;
   a = 10.0 wt% Sn - 90.0 wt % Pb

c) L = 25.0 wt% Sn - 75.0 wt% Pb;

d) L = 10.0 wt% Sn - 90.0 wt% Pb;
       a = 10.0 wt% Sn - 10.0 wt % Pb

T(2) = 200 Celsius:

a) a = 17.0 wt% Sn - 83.0 wt% Pb;
   L = 55.7 wt% Sn - 44.3 wt % Pb

b)   a = 17.0 wt% Sn - 83.0 wt% Pb;
   B = 55.7 wt% Sn - 44.3 wt % Pb

c) a = 18.3 wt% Sn - 81.7 wt% Pb;

       B = 97.8 wt% Sn - 2.2 wt% Pb

d) L = 25.0 wt% Sn - 75.0 wt% Pb;
       a = 25.0 wt% Sn - 75.0 wt % Pb

T(3) = 183 Celsius

a) a = 18.3 wt% Sn - 81.7 wt% Pb;
   B = 97.8 wt% Sn - 2.2 wt % Pb

b)   L = 61.9 wt% Sn - 38.1 wt% Pb;
   a = 18.3 wt% Sn - 81.7 wt% Pb

      B = 97.8 wt% Sn - 2.2 wt% Pb

c) a = 25.0 wt% Sn - 75.0 wt% Pb;

       B = 25.0 wt% Sn - 75.0 wt% Pb

d) L = 25.0 wt% Sn - 75.0 wt% Pb;
       a = 25.0 wt% Sn - 75.0 wt % Pb

    B = 25.0 wt% Sn - 75.0 wt% Pb

T(4) = 100 Celsius

a) a = 25.0 wt% Sn - 75.0 wt% Pb;
   B = 25.0 wt% Sn - 75.0 wt % Pb

b)   L = 25.0 wt% Sn - 75.0 wt% Pb;
   a = 25.0 wt% Sn - 75.0 wt% Pb

      B = 25.0 wt% Sn - 75.0 wt% Pb

c) a = 5.1 wt% Sn - 94.9 wt% Pb;

       B = 98.7 wt% Sn - 1.3 wt% Pb

d) L = 25.0 wt% Sn - 75.0 wt% Pb;
       a = 5.1 wt% Sn - 94.9 wt % Pb

    B = 98.7 wt% Sn - 1.3 wt% Pb

Composition = 25 wt% Sn Composition = 36.8 at% Sn Temperature = degree C Temperature = 32 degree F

Explanation / Answer

1)c

2)a

3)b

4)c

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