Quenching and annealing experiments were performed on bulk specimens and in hot-stage investigations of loop climb in thin foils of Al-1%Mg. The results were compared to those for pure aluminum. It was found that 1%Mg in solid solution had no effect upon the type of loop produced after quenching, nor on the precipitation of vacancies during subsequent aging. As in pure aluminum, quenching stresses determined whether Frank or perfect loops were formed. Magnesium had little effect upon the climb-rate of loops; the activation energy being in the range of 1.2 to 1.28eV; similar to the values obtained using identical experiments on pure aluminum. It was concluded that the vacancy-magnesium binding energy was extremely small. The stacking-fault energies were estimated by comparing the rates of climb of large Frank and perfect loops in the same area of the foil so as to minimize the errors that arose if only the climb of Frank loops was measured. The stacking-fault energies were deduced to be 190mJ/m2 for Al-1%Mg and 210mJ/m2 for pure Al.

Dislocation Climb and Determination of Stacking-Fault Energies in Al and Al-1%Mg. V.C.Kannan, G.Thomas: Journal of Applied Physics, 1966, 37[6], 2363-70