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Grain size, fraction of high and low angle grain boundaries, and recrystallized grain in the SZ region of the AA7075-T6 FSW joint.
| AA 7075-T6 FSW joint at SZ | Average grain size | High angle grain boundaries fraction | Low angle grain boundaries fraction | Fraction of recrystallized grain |
|---|---|---|---|---|
| Square pin | 4.43 μm | 0.864 | 0.136 | 0.947 |
| Hexagon pin | 5.79 μm | 0.612 | 0.388 | 0.845 |
