Reference no: EM132454246

Question 1. Why are nanocrystalline materials stronger? Explain answer based on dislocation  activity.

Question 2. What are the five important factors that affect the recrystallization process in metals?

Question 3. Consider casting a cube and a sphere on the same volume from same metal. Which one would solidify faster? Why?

Question 4. Why is it difficult to improve both strength and ductility simultaneously? 5 points

Bonus questions:

Question 1. Why are cast metal sheet ingots hot rolled first instead of being cold rolled?

Question 2. Why does slip in metals usually take place on closed packed planes and in closed packed directions?

Question 1.(a) Explain the three stages of annealing treatment in 2-3 sentences each.
(b) Explain any five properties that we can measure using a stress-strain curve under  uniaxial tensile loading.

Question 2. What are the 4 strengthening mechanisms of metals? Explain each mechanism in 4-5 sentences. 10