Core structures of non screw1/2(111) dislocations on (112) planes in b.c.c. crystals. II. Peierls stresses and the effects of an external shear stress on the cores

Abstract

For pt.I, see ibid., vol.5, no.1, 1 (1975). The Peierls stresses of ¹/₂(111) non screw dislocations, the core structures of which were studied in part I, were calculated (1) by positioning the dislocation in various crystallographically non equivalent positions and (2) by simulation of the dislocation in a crystallite subject to an external stress. The first method is inadequate since it overestimates the Peierls stress and does not show any asymmetry connected with the twinning and antitwinning sense of shear. The results are compared with those for non screw dislocations on (110) planes and for the screw dislocation.