Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 46SEP
In the Pb–Sn phase diagram (Fig. 8.12), answer the following questions:
- a. What is α? (Explain in detail including atomic structure.) What is β?
- b. What is the maximum solubility of Sn in α? At what temperature?
- c. What happens to the α in part b if it is cooled to room temperature?
- d. What is the maximum solubility of Sn in liquid metal at the lowest possible temperature? What is that temperature?
- e. What is the solubility limit of Sn in α when liquid is present? (This will be a range.)
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A lead-tin (Pb-Sn) alloy of composition 30 wt % Sn and 70 wt % Pb is slowly heated from a temperature of 140 OC. Refer to the phase diagram provided in Figure 1 and answer the following.
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BINARY PHASE DIAGRAMS
Please only answer parts d and e as the rest have been solved.
Show full detailed explanation to answers with diagrams if necessary a)(i) What is the melting point of pure Mg?(ii) What is the maximum solubility of Mg in Pb and at what temperaturedoes this occur?
(b) A 50 wt.% Pb-50wt% Mg alloy is slowly cooled from 700 °C to 400 °C.(i) At what temperature does the first solid phase form?(ii) What is the composition of this solid phase?(iii) At what temperature does all the liquid solidify?(iv) What is the composition of the last remaining liquid phase?(v) What is the freezing range? (c) What is the mass fraction of solid and liquid of a 60 wt.% Mg alloy at atemperature of 500 °C.(d) Draw and label the microstructure of an 80 wt.% Mg alloy at 600 °C.(e) A Mg-Pb alloy of mass 5.5 kg has a composition just slightly below thesolubility limit of 200 °C.(i) What mass of lead is in the alloy?(ii) If the alloy is heated to 350 °C how much more lead can be dissolvedin…
According to the following graph, two samples of 1080 steel are cooled from the eutectoid
temperature, one at a cooling rate of 250°C/s and the other at a cooling rate of 7.27x10-8 °C/s.
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Chapter 8 Solutions
Foundations of Materials Science and Engineering
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