Electron microscope examination of quenched aluminium containing 0.65wt% of magnesium revealed the presence of double-faulted multi-component double-faulted and triple-faulted dislocation loops. The annealing rate of the double-faulted loops was investigated as a function of temperature and the extrinsic stacking fault energy was determined to be 157mJ/m2; 1.4 times greater than the intrinsic fault energy.

The Formation and Annealing Behaviour of Multi-Faulted Loops in an Aluminium-Magnesium Alloy. S.Kritzinger, R.E.Smallman, P.S.Dobson: Acta Metallurgica, 1969, 17[1], 49-58