Abstract
The weak-beam method of electron microscopy has been used to study in detail faulted dipoles in several pure f.c.c. metals and alloys. Direct experimental evidence is presented for two mechanisms by which the defects can be formed: by transforming ordinary dipoles or pulling out faulted ones. Interactions between faulted dipoles and glide dislocations are discussed in detail with experimental evidence showing how such dipoles can be rotated or cut up into small sections. Constrictions on faulted dipoles have also been studied and their origin is discussed.