Mechanism for the formation of slip lines around a dynamical indentation on {100} faces of sodium chloride single crystals

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Abstract
A mechanism is suggested to explain the formation of square blocks of slip lines that usually arise around a dynamical indentation on {100} faces of sodium chloride single crystals. On the basis of this mechanism, a peculiar feature observed about these lines - ie their most marked development at the corners of the indentation and apparent incompleteness at their centres - is explained. It is shown that a [100] slip line is formed by the joining of two segments of screw dislocation walls which start from either corner of the indentation and move towards each other. When the joining of these segments is not possible because of their non-coplanarity, obstruction to their motion by rows of edge dislocations, etc, slip lines are formed which appear incomplete at their centres.

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