The peculiar effect of forest dislocations on single twin layer development in zinc and beryllium single crystals

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

“…For pulsations, let us choose the mode with˙= = const = at the loading and˙= const = ′ at the unloading. As it was in experiments [9][10][11][12][13], let the loading rate be much lower than the unloading one: ≪ ′ . The amplitude of the stress pulsations is denoted as 0 .…”

“…where ′ = 0 − 0 2 is the relative shift of twin boundaries in the first loading cycle minus the elastic part 0 2 . We emphasize that, in essence, this phenomenon is a result of the hardening loss by the twin boundaries at stress pulsations, which was studied experimentally [9][10][11][12][13]. Furthermore, the fact that the proposed phenomenological model contains this effect, a b 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.…”