1. True (T) or False (F) a) Dislocation free materials are possible albeit difficult to produce. b) Dislocation climb is a process that requires the diffusion of void defects. c) Both the Burger's vector and line vector vary along curved dislocation lines. d) Preferred slip directions in crystals tend to be the closest packed directions. e) Dislocations always repel each other because they stress and strain the crystal lattice. _f) During the recovery phase of annealing, the dislocations formed during cold working rearrange themselves into a lower energy configuration. g) Recrystallization will always occur in metals if the temperature is high enough, regardless of its initial state. h) Grain growth always occurs rapidly thus a single crystal can be achieved from a polycrystal after a few days of annealing. i) Solute atoms prefer to congregate within dislocations reducing the over-all strain energy of the crystal. j) Any alloy composition with two stable phases at room temperature can be precipitation strengthened. k) Large precipitates are most effective at strengthening because each one can block many, many dislocations. I) Hooke's Law uses the entire set of stress and strain data to compute the elastic modulus of the material being tested.