TWINNING IN BCC STRUCTURE (CALCULATION AND CONSTRUCTION)

Crystallographic-texture formation during twinning in bcc metals upon tension, compression, and rolling (planar strain) is calculated using atomicshear model. Orientations formed by slip preceding the twinning were considered as starting orientations. The crystallography of the t winning orientations was determined for the {112}[111] twinning system s and the theoretical reverse figures for tension and compression as w ell as the (220) direct pole figure for the {221}[114] orientation obt ained by the twinning of the {001}[110] orientation due to the planar strain under the rolling were constructed. The {112}[110] and {111}[11 0] starting orientations could be twinned only upon the rolling with s preading.