1. Why are nanocrystalline materials stronger? Answer based on dislocation activity. 2. A 70% Cu–30%

1. Why are nanocrystalline materials stronger? Answer based on dislocation activity. 2. A 70% Cu–30% Zn brass sheet is 0.0955 cm thick and is cold-rolled with a 30% reduction in thickness. What must be the final thickness of the sheet?