(f) Circle the correct answer that completes the sentence below. A tilt grain boundary is one where the axis of rotation of the grains is the plane of the grain boundary. (i) parallel to (ii) perpendicular to (iii) is canted out of the plane by an angle =90 from (g) Circle the correct answer that completes the sentence below. The spacing between edge dislocations, D, the tilt angle of the grain boundary. (i) is independent of (ii) is inversely proportional to (iii) has a linear relationship with (iv) has a quadratic relationship with Note: Twist grain boundaries are related to screw dislocations in a similar manner, but the pictures are much more difficult to draw