You do not need to redraw the figure You are given 2.8 kg of a lead-tin alloy at 180°C, that is 90% tin (Sn). a) Draw the equilibrium structure if the alloy is at 200 C b)What will be the composition (Wt% of the different phases) at 200 C c)Draw the structure if the alloy is cooled slowly to 150 C d)What will be the composition (Wt% of the different phases) at 150 C e)Would you expect the 90% Sn alloy or a 61.9 %Sn alloy to have a higher yield stress? Explain your answer f)If the sample were rapidly cooled (quenched) from 200C t 150 C do you expect it would have the same structure as C? If not draw at the proposed structure for a quenched sample. Do you expect the mechanical properties to be significantly different than part c? Composition (at% Sn) 0 20 40 60 80 100 Temperature (°C) 300 200 100 (Pb) 327°C a + L 18.3 20 183°C B Liquid 61.9 40 60 Composition (wt% Sn) 80 B+L 232°C 97.8 I 600 500 400 300 200 100 (Sn) 100 Temperature (°F)

You do not need to redraw the figure You are given 2.8 kg of a lead-tin alloy at 180°C, that is 90% tin (Sn). a) Draw the equilibrium structure if the alloy is at 200 C b)What will be the composition (Wt% of the different phases) at 200 C c)Draw the structure if the alloy is cooled slowly to 150 C d)What will be the composition (Wt% of the different phases) at 150 C e)Would you expect the 90% Sn alloy or a 61.9 %Sn alloy to have a higher yield stress? Explain your answer f)If the sample were rapidly cooled (quenched) from 200C t 150 C do you expect it would have the same structure as C? If not draw at the proposed structure for a quenched sample. Do you expect the mechanical properties to be significantly different than part c? Composition (at% Sn) 0 20 40 60 80 100 Temperature (°C) 300 200 100 (Pb) 327°C a + L 18.3 20 183°C B Liquid 61.9 40 60 Composition (wt% Sn) 80 B+L 232°C 97.8 I 600 500 400 300 200 100 (Sn) 100 Temperature (°F)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

You do not need to redraw the figure
You are given 2.8 kg of a lead-tin alloy at 180°C, that is 90% tin (Sn).
a) Draw the equilibrium structure if the alloy is at 200 C
b)What will be the composition (Wt% of the different phases) at 200 C
c)Draw the structure if the alloy is cooled slowly to 150 C
d)What will be the composition (Wt% of the different phases) at 150 C
e)Would you expect the 90% Sn alloy or a 61.9 %Sn alloy to have a higher
yield stress? Explain your answer
f)If the sample were rapidly cooled (quenched) from 200C t 150 C do you
expect it would have the same structure as C? If not draw at the proposed
structure for a quenched sample. Do you expect the mechanical
properties to be significantly different than part c?
Composition (at% Sn)
20
40
60
80
100
327°C
Temperature (°C)
300
200
100
(Pb)
a + L
18.3
20
183 C
a + B
Liquid
61.9
40
60
Composition (wt% Sn)
80
B+L
232°C
97.8
B
600
100
(Sn)
500
400
300
200
100
Temperature (°F)

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