a. If the grain boundary strength constant is 400 psi/in. and the strength of a grain is 30,000 psi, what is the change in strength if the grain size goes from 0.001 in. to 0.003 in.? b. An annealed...

a. If the grain boundary strength constant is 400 psi/in. and the strength of a grain is 30,000 psi, what is the change in strength if the grain size goes from 0.001 in. to 0.003 in.?

b. An annealed aluminum wire is drawn through a die to reduce the diameter from 10 mm to 8 mm. What is the amount of cold work in the material after drawing?