Abstract

In order to make clear the inhomogeneity of plastic deformation of neutron-irradiated copper crystals, detailed observation of primary and secondary slip band and precise examination of lattice rotation have been carried out in yielding and stage I deformation using an etch-pit technique and a precise Laue method. Main results are as follows: (i) a free surface plays an important role for the multiplication of primary and secondary dislocations, and (ii) secondary slips contribute to the completion of plastic bending of a crystal due to the constraint of grips and the heterogeneity of deformation.

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