Comment on ‘Transmission electron microscopy of dislocation structures in iron-doped Al₃Ti with the L1₂ structure’

Abstract

In deformed L1₂ Al₃Ti, a transition of the dissociation of ⟨110⟩ superdislocations from two superpartials with ⅓⟨112⟩ Burgers vectors (mode II) at a low temperature to two superpartials with collinear ½⟨110⟩ Burgers vectors (mode I) at a high temperature, has been reported by Inui et al. in 1992. The weak-beam electron microscopy observations presented by these authors are re-examined. It is shown that the contrasts observed in the microstructure of deformation at a low temperature are fairly consistent with a narrow splitting into mode I rather than a dissociation according to mode II.