eo2mtm - Engineering 45 The Structure and Properties of...

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Engineering 45 The Structure and Properties of Materials Midterm Exam March 18, 2002 Problem 1: (a) Describe the ß-ZnS structure and show how it is related to the FCC structure. (b) The ß-ZnS structure is adopted by many covalently bonded compounds, like GaAs. Why would this structure be favored? [Ga has valence 3, As has valence 5.] (c) The ß-ZnS structure is also adopted by some ionic compounds, like AgI. What feature of the ß-ZnS structure makes it suitable for ionic materials? (d) Page 1
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Engineering 45: Spring, 2002 Midterm Exam Problem 2: (a) Draw an edge dislocation in a simple cubic crystal. Indicate its “Burgers vector” and its “glide plane”. (b) Show how the glide of an edge dislocation causes plastic deformation. (c) Now let the dislocation have the form of a circular loop in its glide plane. Show how the expansion of the loop leads to plastic deformation. Page 2
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Engineering 45: Spring, 2002 Midterm Exam Problem 3: The elements A and B have a simple eutectic phase diagram. (a) Draw a possible form for the phase diagram and label the phase fields.
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eo2mtm - Engineering 45 The Structure and Properties of...

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