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Substructural developments have been monitored during strain-controlled cycling of aluminum at room temperature. This has allowed a relationship between dislocation substructure and stress response to be developed as a function of the number of cycles.
At the onset of saturation, the dislocations were arranged in a loose cellular network for the particular strain range investigated. Continued cycling resulted in a slight but significant decrease in stress response, associated with the formation of a stable structure. With further strain cycling, the stress response and cell size remained relatively constant. The misorientation between the cells also remained constant, although the boundary width decreased due to dynamic recovery. These results indicate that the cyclic stress response is directly related to the dislocation density, and that at saturation the energy absorbed per cycle causes important changes in cell morphology to take place.
Comparison of these results with those of aluminum, copper and iron obtained under both monotonic and cyclic conditions show that the stress-cell size relationship is characteristic for all these wavy slip mode metals.
substructural changes, misorientation measurements, strain cycling, dynamic recovery, aluminum
Professor and former research assistant, University of Waterloo, Waterloo, Ontario
AMP of Canada, Ltd., Markham, Ontario