Abstract
The energy per unit length, the “line-tension factor”, and the Gibbs-Wulff form are calculated for dislocations of Burgers vectors a/2[1ll], a[00l], and a[1l0] lying in the (110) planes of several body-centred cubic materials spanning a wide range of Zener's anisotropy factor. For even moderately anisotropic materials, the results obtained for the a/2[111] and a[00l] dislocations differ greatly from the predictions of the isotropic theory, but most of the a[110] dislocation properties are insensitive to anisotropy. Reaction energies for the formation of a[001] and a[110] dislocations from pairs of a/2〈111〉 dislocations were also calculated, and it was found, contrary to the isotropic theory, that the a[1l0] dislocation can be a stable defect over certain angular ranges in sufficiently anisotropic materials, owing to the great effect of anisotropy on the hypothetical dissociation products.
Get full access to this article
View all access options for this article.