Dislocation in Cubic Crystals

摘要

Exact expressions for the displacement and stress components of a dislocation parallel to a axis in a cubic crystal have been derived. For /{112} and /{111} dislocations, the stress components σxx(y=0), σyy(y=0), and σxy(x=0) are found to be nonzero. It was shown that σxy≠0 at x=0 has no effect on the stability of a vertical wall of edge dislocations. The energy factor K was computed for the dislocations in bcc, fcc, and diamond-cubic crystals. By comparison, the elastic energy of an edge dislocation on the {110} slip plane in bcc crystals is generally less than that on the {112} slip plane. The differences, however, are very small except in a few cases of highly anisotropic crystals such as Li, K, Na, and β-brass.