Planar defects present in annealed D019 Co3W crystals were investigated by conventional transmission electron microscopy. Although a predominance of superlattice stacking faults was observed, five antiphase boundaries and four complex stacking faults were identified. All planar defects were observed in locked configurations or ended at grain boundaries. A comparison of relative defect energies was carried out with a geometrical model based upon pair-wise interaction energies. The results suggested that the relative number of defects was not directly related to their expected energy, but rather has origin in locked configurations adopted during crystal growth and annealing.

Complex and Superlattice Stacking Faults in D019 Co3W. I.D.Nogueira, P.A.Carvalho, J.C.Pereira, R.Vilar: Philosophical Magazine, 2006, 86[12], 1763-74