Question: (a) For a given material, would you expect the surface energy to be greater than, the same as, or less than the grain boundary energy?

(a) For a given material, would you expect the surface energy to be greater than, the same as, or less than the grain boundary energy? Why?
(b) The grain boundary energy of a small-angle grain boundary is less than for a high-angle one. Why is this so?

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