It was shown how images of stacking faults in body-centered cubic metals could be analysed in field-ion micrographs, and the method was applied to tungsten. A mixed dislocation lying close to the [142] direction and having a Burgers vector of a/2[111] was shown to have dissociated twice. The dislocation dissociated on {110} planes in accord with either the dissociation proposed by Cohen–Crussard or that proposed by Wasilewski–Foxall. A tentative value for the stacking-fault energy of 50mJ/m2 was obtained, in the suspected presence of impurity segregation.

The Analysis of Field-Ion Micrographs - Stacking Faults in Tungsten. D.A.Smith, K.M.Bowkett: Philosophical Magazine, 1968, 18[156], 1219-33