Answer:
Explanation:
a) the temperature at which the first solid phase form is calculated upon the cooling from 700°c , the first solid phase form at the temperature at which a vertical line at their composition intersect the line L - ( ∝ + L) Phase boundary i.e about 360°c.
b) What is the composition of this solid phase? ; the composition of the first solid phase form corresponds to the intersection with the ∝ - (∝+L) phase boundary at a line constructed across the (∝+L) phase. Region at 560°c i.e 21wty. Pb or -79wty.mg
c) temperature at which the liquid completely solidify is about 465°C which is obtained by the intersection of the composition. wt; pbg so with the eutectic isotherm , i.e about 465°c.
d) the composition of the last remaining liquid face prior to the complete solidification corresponds to the eutectic composition. i.e 67wty.Pb - 33wty. mg
The temperature at which the first solid phase forms is; 560°C.
A) From the attached Mg-Pb phase diagram, we can say that the temperature at which the first solid phase forms is 560°C. This is because upon cooling from 700°C, the first solid phase is seen to form at the temperature at which a vertical line at this composition intersects the L - (α + L) phase boundary at that temperature of 560°C.
B) From the attached Mg-Pb phase diagram, we can tell that the composition of this solid phase at 560°C is 21 wt% Pb 79 wt% Mg.
C) The temperature at which the liquid solidifies is at 465°C. This is because we see that complete solidification of the alloy occurs at that temperature which is the intersection of the same vertical line at 50
wt% Pb with the eutectic isotherm.
D) The composition of the last liquid phase remaining prior to complete solidification is 67 wt% Pb-33 wt% Mg because it corresponds to the eutectic composition.
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