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The grain boundary mobility is known to vary by several orders of magnitude with variation in grain boundary crystallography within a single material,
while the grain boundary energy rarely varies by more than a factor of two (neglecting twins and very low angle boundaries).
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¸ù¾ÝÉÏÏÂÎÄ£¬ÕâÀïa factor of twoÓ¦¸ÃÊÇÖ¸a factor of two magnitudes
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