Mechanism underlying the formation of dislocation is expounded on Thomas Fermi Dirac Cheng(TFDC) electron theory. The criterion condition on the limit size of dislocation is raised, and the calculated results of the limit sizes of a set of elements are given.
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[Cheng Kaijia, Cheng Shuyu. On the Stability of Dislocation[J]. Rare Metal Materials and Engineering,2002,(2):81~83.] DOI：[doi]