Abstract
The sources of the multiplicity of metastable structures of grain boundaries are discussed using a recently developed structural unit model of grain boundary structure. Two sets of computer calculations of symmetrical tilt boundaries are presented and it is shown that the calculated multiplicity of metastable structures is readily predicted by the structural unit model. This multiplicity is likely to be very extensive in the case of general grain boundaries. The implications of the structural multiplicity of grain boundaries for various grain boundary phenomena as well as for interpretation of “direct observations” of grain boundary structure are discussed.
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