Stacking-fault energy measurements on nickel-cobalt alloys, obtained by three different methods, have been compared. The combined results from the node and empirical texture methods differ from those obtained by the tetrahedron method, which are consistently lower though showing the same form of variation with composition. The discrepancy is critically discussed and a probable value of 240 ± 50 ergs/cm2 obtained for the stacking-fault energy of nickel.
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