5. Briefly describe the microstructure and characteristics of pearlite and spheroidite? Which is more stable, the pearlitic or the spheroiditic microstructure? Why? (10%)

6. The electrical conductivity and electron mobility for aluminum areand 0.0012 m2 /V●s, respectively. Calculate the Hall voltage for an aluminum specimen that is 15 mm thick for a current of 25 A and a magnetic field of 0.6 tesla (imposed in a direction perpendicular to the current). (10%)