E 45 - Spring 2006 - Morris - Midterm 1

E 45 - Spring 2006 - Morris - Midterm 1 - Engineering 45...

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Page 1 Engineering 45 The Structure and Properties of Materials Midterm Exam March 22, 2006 Problem 1: (35 points) (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 characteristic of these compounds would favor β -ZnS over other ionic structures? (d) Under what conditions might a metallic AB compound choose the β -ZnS structure?
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Engineering 45: Spring, 2006 Midterm Exam Page 2 Problem 2: (30 points) (a) Draw an edge dislocation in a simple cubic crystal. (b) Show how the glide of that dislocation produces plastic deformation. (c) Define the “climb” of an edge dislocation and explain why it is difficult for an edge dislocation to climb unless the temperature is high. (d) When a metal is severely deformed the diffusivity of substitutional species
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This note was uploaded on 01/27/2011 for the course BIOE 104 taught by Professor Various during the Spring '10 term at University of California, Berkeley.

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E 45 - Spring 2006 - Morris - Midterm 1 - Engineering 45...

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