Abstract

By the Berg-Barrett method, X-ray diffraction micrographs of the clustered slip region in elongated aluminium single crystals were taken. The micrographs taken showed four kinds of striations (S1, S2, S′, Sb) related with the active slips. Analysing these striations the following have been found: (1) The striations S′ are observed in both the primary and the secondary slip regions, the former corresponding to the small secondary slip region taking place in the primary slip region, and the latter the other way round. (2) In the secondary slip region there are no kink bands belonging to the secondary slip system but the strain due to deformation is concentrated near the boundary between the primary and the secondary slip regions, probably originated from the constraints due to the lattice deformation in both the regions. (3) The striations S1 are straight and inclined, in the present case, by several degrees of arc to the primary slip trace, in an extent larger than can be attributed to experimental error. (4) The primary slip region, compared with the secondary one, has a larger bending strain of long range (of the order of the width of a kink band).

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