FEATURES OF EVOLUTION OF WEDGE-SHAPED TWINS IN BISMUTH SINGLE CRYSTALS SUBJECTED TO POLYSYNTHETIC TWINNING

摘要

Features of evolution of wedge-shaped twins in bismuth single crystals with poly synthetic twins are examined. Polysynthetic twins are found to promote an increase in number, and a decrease in length, of indentation-induced wedge-shaped twins. The latter quantities depend on the density of twins in a polysynthetic twin. Based on the dislocation model, stress fields in the vicinity of wedge-shaped and polysynthetic twins are calculated at a mesoscopic level.