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9Â¥2012-03-08 16:25:55
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2Â¥2012-03-07 21:41:55
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3Â¥2012-03-07 21:56:47
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²»ºÃÒâ˼£¬ÎÒ²»ÖªµÀÔõôÉÏ´«Í¼Æ¬£¬ÏÂÃæÕâ¸öÊÇwikipediaÁ´½Ó£¬ÀïÃæÓÐ http://en.wikipedia.org/wiki/Grain_boundary ÎÒ°ÑÆäÖÐÒ»²¿·Ö¸´ÖƳöÀ´°É£º In coincident site lattice (CSL) theory, the degree of fit (¦²) between the structures of the two grains is described by the reciprocal of the ratio of coincidence sites to the total number of sites. Thus a boundary with high ¦² might be expected to have a higher energy than one with low ¦². Low-angle boundaries, where the distortion is entirely accommodated by dislocations, are ¦²1. Some other low ¦² boundaries have special properties especially when the boundary plane is one that contains a high density of coincident sites. Examples include coherent twin boundaries (¦²3) and high-mobility boundaries in FCC materials (¦²7). Deviations from the ideal CSL orientation may be accommodated by local atomic relaxation or the inclusion of dislocations into the boundary. |
4Â¥2012-03-07 22:36:00









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