Read Callister, Chapters 11 and 12. Solve and hand in Problems 11.6, 11.13, 11.26, 12.12, 12.18, 12.28 and 12.46, due date February 18. (Note that Monday Feb 16 and Tuesday Feb 17 are Spring Reading Break, so there won't be a class on Monday 16.)

Question 11.6

On the basis of microstructure, briefly explain why gray iron is brittle and weak in tension.

Question 11.13

Why must rivets of a 2017 aluminium alloy be refrigerated before they are used?

Question 11.26

Cite three sources of internal residual stresses in metal components. What are two possible adverse consequences of these stresses?

Question 12.12

Iron titanate, FeTiO3, forms in the ilmenite crystal structure that consists of an HCP arrangements of O2- ions.

  1. Which type of interstitial site will the Fe2+ ions occupy? Why?
  2. Which type of interstitial site will the Ti4+ ions occupy? Why?
  3. What fraction of the total tetrahedral sites will be occupied?
  4. What fraction of the total octahedral sites will be occupied?

Question 12.18

Cadmium Sulfide (CdS) has a cubic unit cell, and from X-ray diffraction it is known that the cell edge length is 0.582 nm. If the measured density is 4.82 g/cm3, how many Cd2+ and S2- ions are there per unit cell?

Question 12.28

Determine the angle between covalent bonds in an SiO4-4 tetrahedron.

Question 12.46

The modulus of elasticity for titanium carbide (TiC) having 5 vol% porosity is 310 GPa.

  1. Compute the modulus of elasticity for the non-porous material
  2. At what volume percent porosity will the modulus of elasticity be 240 GPa?