Conclusions
In this study the influence of material positioning on the fatigue
strength of the friction stir processed dissimilar FSWed AA6082/AA8011
and AA8011/AA6082 was successfully carried out. Based on the results
obtained the following concluding remarks were made:
- The tensile properties of AA6082/AA8011 were found to be higher
compared to the joint produced with AA8011/AA6082.
- The microstructural analysis revealed a correlation between material
positioning and grain sizes. There was a notable decrease in grain
size at the NZ when AA6082 was positioned on the advancing side during
processing.
- 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 and this affirmed that the material
psotioning contributes towards the fatigue strength of the joint.