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HW10 ENME382 S10 Section0201

# HW10 ENME382 S10 Section0201 - β and eutectic...

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ENME 382 Section 0201 Homework 10 Due in class: May 7, 2010 1. Cite the phases that are present and the phase compositions for the following alloys and determine the relative amounts (in terms of mass fractions) of the phases for the alloys and temperatures: (a) 25 wt% Pb–75 wt% Mg at 425°C (800°F) (b) 55 wt% Zn–45 wt% Cu at 600°C (1110°F) (c) 7.6 lb m Cu and 144.4 lb m Zn at 600°C (1110°F) (d) 4.2 mol Cu and 1.1 mol Ag at 900°C (1650°F) 2. A 50 wt% Ni–50 wt% Cu alloy is slowly cooled from 1400°C (2550°F) to 1200°C (2190°F). (a) At what temperature does the first solid phase form? (b) What is the composition of this solid phase? (c) At what temperature does the liquid solidify? (d) What is the composition of this last remaining liquid phase? 3. For a lead–tin alloy of composition 80 wt% Sn–20 wt% Pb and at 180°C (355°F) do the following: (a) Determine the mass fractions of α and β phases. (b) Determine the mass fractions of primary

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Unformatted text preview: β and eutectic microconstituents. (c) Determine the mass fraction of eutectic β . 4. Consider 3.5 kg of austenite containing 0.95 wt% C, cooled to below 727°C (1341°F). (a) What is the proeutectoid phase? (b) How many kilograms each of total ferrite and cementite form? (c) How many kilograms each of pearlite and the proeutectoid phase form? (d) Schematically sketch and label the resulting microstructure. 5. For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode. (a) Aluminum and cast iron (b) Cadmium and zinc (c) Low-carbon steel and copper Study problems: 1. What is the carbon concentration of an iron–carbon alloy for which the fraction of total cementite is 0.10? 2. Compute the mass fractions of proeutectoid ferrite and pearlite that form in an iron– carbon alloy containing 0.35 wt% C....
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HW10 ENME382 S10 Section0201 - β and eutectic...

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