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homework.4 - silicon and aluminum(c At what temperature...

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Chem 584 Introduction to Materials Chemistry Homework #4 Due at the beginning of lecture, Monday, Oct. 6 (Show work) 1) Consider a sample of 100 grams silicon and 900 grams aluminum heated to 1000 °C and then cooled slowly to 25 °C. Answer the following questions using the Al-Si equilibrium phase diagram shown below. If you have to calculate an answer, show your work. If you read the answer directly from the phase diagram, just say so.
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(a) Upon cooling, at what temperature will the first solid phase appear? (b) What is the composition of the phase formed in (a), in terms of weight percent
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Unformatted text preview: silicon and aluminum? (c) At what temperature will the entire sample solidify? (d) How much of the proeutectic phase (in grams) will be present in the sample formed in (c). (e) At 576 °C, how is the silicon distributed in the microstructure, that is, how many grams of silicon are in the proeutectic phase and each of the two eutectic phases? 2) Determine the relative amounts ( in terms of mass fractions) of the phases for the alloys and temperatures given in Problem 9.8. Calister problems: 9.8, 9.9, 9.13, 9.32, 9.56, 10.1, 10.13,...
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