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Material positioning influence towards fatigue strength of the friction stir processed AA8011/AA6082 joints
  • Velaphi Msomi,
  • Sipokazi Mabuwa
Velaphi Msomi
Cape Peninsula University of Technology - Bellville Campus
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Sipokazi Mabuwa
Cape Peninsula University of Technology - Bellville Campus
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Abstract

The investigation on the fatigue behaviour of the processed friction stir welded AA8011/AA6082 dissimilar joint is reported in this work. The single-pass friction stir processing technique was applied on the friction stir welded AA8011/AA6082 and AA6082/AA8011 dissimilar joints. The friction stir processing was conducted under normal conditions (room temperature). The samples were prepared for different analysis using the waterjet cutter technology. The tests conducted include tensile, microstructural analysis, microhardness, fatigue and fracture surface morphology. The microstructural analysis revealed a correlation between material positioning and grain sizes. There was a notable decrease in grain size when AA6082 was positioned on the advancing side during processing. The tensile properties of the joint processed with AA6082/AA8011 were found to be higher compared to the joint produced with AA8011/AA6082. The AA6082/AA8011 joint was found to be more ductile compared to AA8011/AA6082 joint. The stir zone microhardness for the AA8011/AA6082 and AA6082/AA8011 joints was measured to be approximately 60HV and 80HV, respectively. The fatigue strength of AA6082/AA8011 was found to be higher compared to AA8011/AA6082 fatigue strength.