ABSTRACT
Velocities of the groups of screw dislocations (vs) and edge ones (ve) in neutron-irradiated copper crystals were measured at room temperature by observing dynamically the growth of primary slip bands in length. The length of the slip bands increased linearly with time over a long distance. The mean ↑value of vs was smaller than that of ve. From these results, the followings are concluded: (i) The motion of dislocations is not controlled only by the elastic interaction between moving dislocations and irradiation-produced defect clusters but by the jogs resulting from the cutting of small loops by moving dislocations. (ii) The slip bands grow in length and width by the successive formation of dislocation sources by double cross slip like a relay-race.
