Observations by transmission electron microscopy (Hirsch, Horne, and Whelan (1), Bollmann (2), Whelan, Hirsch, Horne and Bollmann (3), Tomlinson (4)] have revealed individual dislocation lines in the interior of thin foils of various metals. The experiments so far have shown that there are marked differences in the behaviour of dislocations in different face centered cubic metals. In aluminium for example (1) the dislocations occur mainly in the boundaries of a substructure, whereas in stainless steel (2, 3) they occur either in pile-ups or irregular networks. Other metals, e.g. copper and nickel (4) show dislocation arrangements of an intermediate character. These differences in dislocation properties in face centered cubic materials are currently interpreted in terms of differences in ribbon widths of extended dislocations, which in turn depend on stacking fault energies.
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