When the grain boundary energy is anisotropic, a grain can penetrate along the grain boundary or the triple junction by solid-state wetting. Grain boundary wetting will take place at the triple junction when the sum of the two grain boundary energies is smaller than the other grain boundary energy. Triple junction wetting can also take place in a 3-dimensional grain structure starting at the four grain corner. It was shown by 3-dimensional Monte Carlo simulation that abnormal grain growth can be induced by such solid-state wetting under a realistic condition in anisotropic grain boundary energy. Experimental evidence, which shows the possibility of abnormal gran growth by such solid-state wetting, was pursued in an initial stage of abnormal gran growth in an Fe-3
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