Abstract
Superplasticity and Crystallographic Orientation Distribution of an Al-Mg-Mn sheet subjected to friction stir processing (FSP) have been investigated. The FSP was developed by adapting the concepts of friction stir welding to obtain a fine grain size in a stirred zone. Tensile specimens with a gauge part of 6mm length, 4mm width and 1.5mm thickness were machined in the transverse direction from a stirred zone of the FS processed sheet of 5mm thickness. Grain refinement was achieved by the FSP to give a smaller grain size of about 4μm than a value of 26μm in the as-received sheet. The SEM/EBSP analysis of the specimen before and after the FSP revealed a fraction of high angle boundaries became a higher percentage of 83% due to the FSP than 75% before. The elongation to failure after the FSP had a maximum value of 361% at 773K and 1.1x10^<-3>s^<-1>. Further, change in crystallographic orientation distribution is investigated during tensile testing in consideration of deformation mechanism.
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