Answered: A 50 wt% Pb-50 wt% Mg alloy is slowly…

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

A 50 wt% Pb-50 wt% Mg alloy is slowly cooled from 700°C (1290°F) to 400°C (750°F).
(i) At what temperature does the first solid phase form?
(ii) What is the composition of this solid phase?
(iii) At what temperature does the liquid solidify?
(iv) What is the composition of this last remaining liquid phase?

Composition (at% Pb)
5
10
20
30
40
70 100
700
1200
L
600
a +L
MB2PB M
1000
500
800
400
L
Mg2 Pb
600
300
400
200
+ Mg2Pb
100
Mg Pb
200
Mg Pb
20
40
60
80
100
(Mg)
Composition (wt% Pb)
(Pb)
Temperature (°C)
LO
Temperature (°F)

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