Figure 5. Optical micrographs, (a) AA6082 base material, (b) AA8011 base material, (c) Friction stir processed FSWed AA6082/AA8011 joint advancing side, (d) Friction stir processed FSWed AA8011/AA6082 joint advancing side, (e) Nugget zone (AA6082/AA8011) and (f) Nugget zone (AA8011/AA6082).