H11 F10 - ENMA 300 Homework 11 Due: Noon Dec 10, 2010 1....

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1 ENMA 300 Homework 11 Due: Noon Dec 10, 2010 1. For each of the following alloys: i) Cite the phases that are present and the phase compositions for each phases and ii) determine the relative amounts (in terms of mass fractions) of the phases for the alloys at the given temperature: (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.
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This note was uploaded on 08/02/2011 for the course ENMA 300 taught by Professor Alsheikhly during the Spring '11 term at University of Maryland Baltimore.

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H11 F10 - ENMA 300 Homework 11 Due: Noon Dec 10, 2010 1....

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