Bundle: Sustainable Energy, 2nd + Mindtap Engineering, 1 Term (6 Months) Printed Access Card
2nd Edition
ISBN: 9781337896535
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 6, Problem 3P
To determine
Prove that
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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.
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
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))
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- 26) Given the T-T-T curve below, select the process that will result in a microstructure of nearly all bainite. a. Cool to 400°C, hold for 20 seconds, then quench to room temperature b. Cool to 500°C, hold for 10 seconds, then quench to room temperature c. Quench to 125°C, hold for 10 seconds, then reheat to 600°C for more than 100 seconds d. Cool to 725°C, hold for 1,000 seconds, then quench to 125°C e. Cool to 600°C, hold for 1 second, the quench to room temperature Temperature (°C) f. none of the above 900 800 H A+C 1600 1400 700- 1200 A+P 600 P 1000 500H A+B 800 400- Temperature (°F) 4 A 300- M(start) 200 M(50%) 100- M(90%) 600 50% T 0 1 10 102 103 10 105 106 Time (s) 400 200 27) Fatigue failure situations are typically dependent upon which combination of the following factors? a. Slip plane, slip direction, and orientation of the applied load b. Yield strength, elastic modulus, and ductility of the material c. Temperature, time, and applied stress d. Stress amplitude, frequency of…arrow_forwardA teapot with a surface area of 665 cm2 is to be plated with silver. It is attached to the negative electrode of an electrolytic cell containing silver nitrate (Ag+ NO3−). The cell is powered by a 12.0-V battery and has a resistance of 1.30 Ω. If the density of silver is 1.05 104 kg/m3, over what time interval does a 0.133-mm layer of silver build up on the teapot?arrow_forwardThe following information is given for cadmium at 1atm: boiling point = 765 °C Hvap(765 °C) = 100 kJ/mol melting point = 321 °C Hfus(321 °C) = 6.11 kJ/mol specific heat solid= 0.230 J/g°C specific heat liquid = 0.264 J/g°C __________kJ are required to melt a 31.0 g sample of solid cadmium, Cd, at its normal melting point.arrow_forward
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