Ehab A El-Danaf
Articles written in Bulletin of Materials Science
Volume 34 Issue 7 December 2011 pp 1447-1453
Commercial 5083 Al rolled plates were subjected to friction stir processing (FSP) with two different processing parameters, having 430 and 850 rpm tool rotational speed with a single traverse feed rate of 90 mm/min. These FSP conditions resulted in two fine grained microstructures of 0.95 𝜇m (430 rpm) and 2.6 𝜇m (850 rpm). Tensile elongations were measured at a relatively low temperature of 250°C at three strain rates, and demonstrated that a decrease in grain size resulted in significantly enhanced ductility and lower forming loads. The occurrence of a relatively high value of strain rate sensitivity, 𝑚 of 0.45 for a grain size of 0.95 𝜇m, suggests the operation of superplastic deformation under these present experimental conditions.
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