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ECE331_Wi06_hw8_sol

# ECE331_Wi06_hw8_sol - ECE331 Homework#8 Solution(Due Friday...

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1 ECE331 Homework #8 Solution (Due Friday, March 10, 2006) 1. Callister, 9.13 This problem asks us to consider a specimen of ice I which is at -10 ° C and 1 atm pressure. (a) In order to determine the pressure at which melting occurs at this temperature, we move vertically at this temperature until we cross the Ice I -Liquid phase boundary of Figure 9.33. This occurs at approximately 570 atm; thus the pressure of the specimen must be raised from 1 to 570 atm. (b) In order to determine the pressure at which sublimation occurs at this temperature, we move vertically downward from 1 atm until we cross the Ice I -Vapor phase boundary of Figure 9.33. This intersection occurs at approximately 0.0023 atm. 2. Callister, 9.20 Upon heating a lead-tin alloy of composition 30 wt% Sn-70 wt% Pb from 150 ° C and utilizing Figure 9.7: (a) the first liquid forms at the temperature at which a vertical line at this composition intersects the eutectic isotherm--i.e., at 183 ° C; (b) the composition of this liquid phase corresponds to the intersection with the ( α + L )- L phase boundary, of a tie line constructed across the α + L

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ECE331_Wi06_hw8_sol - ECE331 Homework#8 Solution(Due Friday...

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