Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Question
Chapter 5, Problem 5.2P
(a)
To determine
The change in Gibbs free energy.
(b)
To determine
Whether the transformation is spontaneous or reversible.
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2. In a copper-nickel system as shown in figure, an alloy composition of 35 wt% Ni was
cooled down from the temperature of 1300°C. Sketch the expected microstructures at
the point a, b, c, d and e and briefly describe the development of these microstructures
in the equilibrium cooling.
L.
L
(35 Ni)
1300
L (32 Ni)
a (46 Ni)
a(43 Ni)
L (24 Ni)
d
1200
1100
20
30
40
50
Composition (wt% Ni)
Temperature (°C))
A magnesium-lead alloy of mass 6.4 kg consists of a solid a phase that has a composition just slightly below the solubility limit
at 300°C (570°F). The magnesium-lead phase diagram is shown in Animated Figure 9.20.
(a) What mass of lead is in the alloy?
i
kg
(b) If the alloy is heated to 400°C (750°F), how much more lead may be dissolved in the a phase without exceeding the
solubility limit of this phase?
kg
H.W3: Predict the ideal solubility of lead in bismuth at 280°C given that its melting
point is 327°C and its enthalpy of fusion is 5.2 kJ mol-1, M.wt Bi=209 g/mol, M.wt
Pb=209 g/mol.
Chapter 5 Solutions
Materials Science And Engineering Properties
Ch. 5 - Prob. 1CQCh. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 4CQCh. 5 - Prob. 5CQCh. 5 - Prob. 6CQCh. 5 - Prob. 7CQCh. 5 - Prob. 8CQCh. 5 - Prob. 9CQCh. 5 - Prob. 10CQ
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