Answered: Using the Mg-Pb phase diagram below, if…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Using the Mg-Pb phase diagram below, if you start at point A and
cool down very slowly to room temperature (point D), sketch the microstructure associated with each letter, determine what phases are present at each letter, determine the compositions for each phase, and determine the weight in each phase. The Mg-Pb mixture has 20 wt. % Pb in it. You start with 100 kg.

A. 700ºC

B. 600ºC

C. 400ºC

D. 25ºC

Composition (at% Pb)
10
30
40
70 100
700
L.
1200
L.
600
M
a + L
Mg2Pb
1000
500
800
400
L.
Mg2Pb
600
300
400
200
a + M82PB
100
Mg5Pb-
200
Mg Pb
40
60
80
100
(Mg)
Composition (wt% Pb)
(Pb)
Temperature (°C)
20
20
Temperature (°F)

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