Distribution of Dislocations in Germanium Single Crystals during Plastic Deformation

Dislocation configurations in germanium single crystals developed during tensile deformation at 600°C were frozen in by the rapid cooling of deformed crystals under load and investigated with etch pit technique. Distribution patterns of dislocation etch pits at various deformation stages were observed on two kinds of surfaces which were cut out parallel to the cross slip plane (1\bar11) and to the primary slip plane (111). Peculiar distribution patterns of etch pits were developed during stage I, namely, the stripe on the (1\bar11) surface and the dense zone on the (111) surface. Stripe patterns of dislocation etch pits were also observed on the surfaces cut out parallel to the critical slip plane (\bar111) and to the conjugate slip plane (\bar1\bar11). It was found that the stripes on (1\bar11), (\bar111), and (\bar1\bar11) surfaces and the dense zone on (111) surface were interrelated each other. Characteristics of the distribution pattern of etch pits were compared with those observed on f.c.c. metals.

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