Effect of a dislocation forest on the bauschinger effect during the twinning of zinc single crystals

Математичне Узагальнення Результатів Експериментів Зі Спостереження Розвитку Одиничних Двійникових Прошарків У Металевих Матеріалах

“…At the time = 0 ≡ 0 , the stress − 0 will be attained, as well as the strain 2 , which can be calculated by substituting = 0 into expression (30). If plotting the curve ( ) at the opposite-sign loading in the positive direction of coordinate axes, as is done to illustrate the Bauschinger effect [6,7], then the deformation value will be…”

“…Thus, the proposed phenomenological model also involves the Bauschinger effect observed for single twins in various metal crystals [6][7][8]. This circumstance can help one in understanding the meaning of phenomenological parameters, because the magnitude of Bauschinger effect turned out sensitive to the density of forest dislocations in crystals (see Fig.…”

“…At the same time, there is a huge body of experimental works dealing with the twinning, where a large number of interesting phenomena associated with the behavior of twin layers under various conditions were revealed. In particular, these are the Bauschinger effect, which is observed for zinc, bismuth, and beryllium, as well as alloys on their basis [6][7][8]; the effect of hardening loss by the twin boundaries under pulsating loads [9][10][11][12][13][14]; and some features in the behavior of twins at the creeping [15,16] and under a shock load [17]. Those phenomena and effects were not described in the theoretical works mentioned above, because the principal experimental works dealing with them were published a little later.…”