Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 62SEP
Referring to Figure P8.61. explain what happens as 5 wt% salt solution is cooled from room temperature to –30°C. Give information regarding phases available and the compositional changes in each phase.
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(a) Sketch a Pressure-Temperature phase diagram for a pure substance X where liquid X is less dense than solid X. Insert an isobar at 1 atm and an isotherm at 300 K. Clearly label all physical states, triple point, critical temperature and any normal transition temperatures.
Consider the phase diagram below. The three points A, B, and C are at concentrations of 27, 31.9, and 33.8 wt% Ni respectively. The
ends of the tie line are at C1 = 25% wt% Ni and C2 = 35 wt% Ni. What are the weight fractions of the alpha phase at A and the L phase at
B, as well as the alpha phase/L phase ratio at C?
T(°C)
1300-L (liquid)
1200
20
ABC
L + a
C1
30
S
C2
liquidus
40
L + a
solidus
α
(solid).
O a. Walpha=0.12; WL=0.41; Walpha/WL = 9.41
O b. Walpha=0.27; WL-0.26; Walpha/WL = 11.11
O c. Walpha=0.15; WL-0.26; Walpha/WL = 11.80
Od. Walpha=0.20; WL-0.31; Walpha/WL = 7.33
50
wt% Ni
A 50 wt% Ni–50 wt% Cu alloy is heated to a temperature within the a liquid-phase region. If the composition of the alpha phase is 58 wt% Ni, determine the equation of mass fraction of solid phase ,WA
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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- Consider the phase diagram below. The three points A, B, and C are at concentrations of 26.4, 31.3, and 34 wt% Ni respectively. The ends of the tie line are at C1 = 25% wt% Ni and C2 = 35 wt% Ni. What are the weight fractions of the alpha phase at A and the L phase at B, as well as the alpha phase/L phase ratio at C? T(°C) 1300 L (liquid) 1200 20 A B C L + a C1 S liquidus L + a solidus a (solid) 50 wt% Ni a. Walpha=0.21; WL=0.33; Walpha/WL = 13.17 b. Walpha=0.09; WL=0.32; Walpha/WL = 15.00 c. Walpha=0.07; WL=0.46; Walpha/WL = 11.17 d. Walpha=0.14; WL=0.37; Walpha/WL = 9.00arrow_forwardA 45 wt% Pb-55 wt% Mg alloy is rapidly quenched to room temperature from an elevated temperature in such a way that the high- temperature microstructure is preserved. This microstructure is found to consist of the a phase and Mg2Pb, having respective mass fractions of 0.65 and 0.35. Determine the approximate temperature from which the alloy was quenched. Use Animated Figure. °℃arrow_forwardQuenching is a process used to preserve at room temperature a phase which exists in equilibrium at high temperature but which would decompose during equilibrium cooling. Explain the basis of this process in the precipitation process and martensitic transformation. Use phase diagrams when necessary.arrow_forward
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Material Science, Phase Diagrams, Part 1; Author: Welt der Werkstoffe;https://www.youtube.com/watch?v=G83ZaoB3XCc;License: Standard Youtube License