Manufacturing Engineering & Technology
Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 4, Problem 32QTP

Using Fig. 4.4, estimate the following quantities for a 75% Cu–25% Ni alloy: (a) the liquidus temperature, (b) the solidus temperature, (c) the percentage of nickel in the liquid at 1150°C (2102°F), (d) the major phase at 1150°C, and (e) the ratio of solid to liquid at 1150°C.

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A binary alloy having 28 wt% Cu and balance Ag solidifies at 779°C. The solid consists of two phases a and B. Phase a has 9% Cu whereas phase ß has 8 % Ag at 779°C. At room temperature these are pure Ag and Cu respectively Sketch the phase diagram. Label all phases and temperatures. The melting points of copper and silver are 1083 and 9610 respectively s Pà) Estimate the amount of a and B in the above alloy at 779°C and at room temperature.) b) Calculate the mass fraction of phases for 40% Cu alloy at 300 °C and TR c) What is the composition of the alloys in (b)
For a 64 wt% Zn-36 wt% Cu alloy, make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 900°C (1650 F), 820°C (1510 F), 750°C (1380°F), and 600°C (1100 F). Label all phases and indicate their approximate compositions.
For 40 wt% Sn – 60 wt% Pb alloy at 150 oC (at point B) as shown in Figure, i. State the name of phase(s) present. ii. Calculate the composition(s) of the phase(s) present. 600 300 Liquid 500 a+L 200 400 300 100 200 100 20 60 100 (Pb) (Sn) Composition (wt % Sn) Temperature ("C) Temperature ("F)

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