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The ability of the grain boundary to reduce the value of critical free energy ΔG* depends on

The ability of the grain boundary to reduce the value of critical free energy ΔG* depends on Correct Answer CosΦ

The ability of a grain boundary to reduce ΔG (het), i.e. its potency as a nucleation site, depends on cosΦ. The cosΦ is actually the ratio of γαα/γαβ (assuming γαβ is isotropic and equal for both grains).

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