Homework ch9: Due date:12/29 11,19,35,43,50,51,65 Additional problems are below: 1.Asuuming that, at 323K, water can dissolve phenol up to 20wt% while the phenol can dissolve water up to 30wt%. A mixed liquid consists of 70wt% water and 30wt% phenol is poured into a glass beaker and two layers are formed. (a)Draw the H2O-C6H5OH phase diagram around 323K (b)What is the weight percentage of the water-rich layer at 323K? d(phenol)=1.07g/cm^3 2.A Fe-1.0wt%C was furnace cooled to room temperature. (a)What is the amount of pearlite? (b)What is the total amount of cementite? (c)Draw a sketch showing the microstructure of this steel at room temperature 3.In order to braze Si chips with some metal such as Mo, some Si semiconductor are coated(sputtered) with a thin Al-Si alloy layer. (a)Find an Al-Si phase diagram (b)What is the Si content in the Al-Si alloy will you choose, why? ch10: Due date:12/29 6,15,18,20,28,34,D1 Addtional problems are below: 1.Using the isothermal transformation diagram(TTT) for a 4340 steel, determine the final microstructure (in terms of the phases present and their approximate percentages) when a 4340 specimen is subjected to the following time-temperature treatment: Rapidly cool from austenite 650 Celsius degrees, hold for 1000 seconds, rapidly cool to 400 Celsius degrees, hold for 10000 seconds, then quench to room temperature. ch11 Due date:2010/01/05 4,8,11,D1 Please remember to hand in your homework on time. BTW, old tests are also available on the website of the department. --

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