In situ deformation of b.c.c. crystals at low temperatures in a high-voltage electron microscope Dislocation mechanisms and strain-rate equation

The structural dependence of work hardening in low carbon steels

“…At these temperatures substantial motion of edge dislocations is observed, but the mobility of the edge segments is still much greater than that of screws [68,72].…”

“…It is now generally accepted [2,8,72] that the plastic behavior of bee metals at sufficiently low temperatures is determined by the unique properties of a/2<111> screw dislocations, whose low energy configuration is sessile. The behavior of these screws is the cause of one of the most distinctive properties of bee metals, the strong temperature · dependence of the flow stress below a critical temperature.…”

“…Very little plastic .strain is accomplished by the motion of the free edges initially present, and their supply is exhausted in the microstrain region [8,50,68,70,72,94].…”

Loi de comportement en plasticité cristalline pour acier à basse température

“…La contribution des coins ne peut donc pas être négligée. Pour les prendre en compte, nous considérons, comme suggéré par [4] et confirmé en DD par [5], que l'aire balayée par la section vis lors d'un vol entre deux obstacles est égale à celle balayée par la section non-vis, ce qui nous donne :…”

Application of Internal Friction to Analysis of Plastic Behaviour of Crystals

“…metals, screw dislocations are much less mobile than non-screw ones; therefore the macroplastic deformation is controlled by the Peierls barrier -screw dislocations interaction [66,67].…”