MSE 250 – Chan Spring 2016 Homework #7 Due Tuesday, March 29, 2016 Show all work. Box final answers. 1. [15 points] Using the NaCl-H2O phase diagram from Lecture 14.2, please answer the following questions. (a) How many pounds of ice can 1 lb of NaCl melt at 30 o F? At 20 o F? (b) The Dead Sea has a salinity of 33.7%

MSE 250 – Chan Spring 2016 Homework #7 Due Tuesday, March 29, 2016 Show all work. Box final answers. 1. [15 points] Using the NaCl-H2O phase diagram from Lecture 14.2, please answer the following questions. (a) How many pounds of ice can 1 lb of NaCl melt at 30 o F? At 20 o F? (b) The Dead Sea has a salinity of 33.7%. Assuming that this is the wt% of NaCl in water, how many phases are present in the Dead Sea and what are they? If the Atlantic Ocean is only 3.7 wt% NaCl on average, how many phases are present and what are they? Assume a temperature of 40 o F. (c) The Titanic sank after hitting an iceberg. If the temperature was -2 o C that night, what was the salinity in the ocean in order to have the coexistence of ice and salt water? 2. [24 points] Using the Al-Cu phase diagram shown below, please answer the following questions for each temperature and composition (Lecture 14.2, Callister 9). (i) What phases are present, e.g. L, α, … etc. ? (ii) What is the composition of each phase, e.g. wt% of Al and wt% of Cu? (iii) How much of each phase is present, e.g. % L, % α, etc.? (iv) Draw a sketch of the equilibrium microstructure. (a) 33.2 wt% Cu at 456 o C (b) 5 wt% Cu at 600 o C (c) 2.5 wt% Cu at 400 o C (d) 45 wt% Cu at 400 o C (e) 40 wt% Cu at 700 o C (f) 2.5 wt% Cu at 600 o C

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