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

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Page 1 Engineering 45 The Structure and Properties of Materials Midterm Exam March 18, 2002 Problem 1: (a) Draw the face-centered cubic structure (fcc), and identify the positions of the octahedral and tetrahedral voids within it. (b) Describe how the NaCl structure is related to fcc. The NaCl structure is a common structure for binary compounds with ionic bonding, but not covalent bonding. Why? (c) Describe how the ß-ZnS structure is related to fcc. The ß-ZnS is a common structure for binary compounds that are covalently bonded. Why?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Engineering 45: Spring, 2002 Midterm Exam Page 2 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.
Background image of page 2
Engineering 45: Spring, 2002 Midterm Exam Page 3 Problem 3:
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online