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Abstract
The effects of varying the stacking-fault energy (SFE) on the microstructure produced during creep for a series of a-brasses have been investigated. A dislocationcell structure was observed in all the alloys examined but its intensity of formation decreased with decrease in SFE. The dislocation density within the cells was low for the alloys of high SFE. All the microstructures were very inhomogeneous. Evidence for twinning and short-range ordering during creep was obtained. The minimum creep rate was found to satisfy the relationship
έs = Aγm(σ/E)n exp(−δH/RT)
The parameter m was determined as 2.5; n was temperature-dependent, being ∼5 at 673 K and ∼3 at 873 K, and did not show a systematic variation with SFE.