Suppression of abnormal grain growth in friction-stir welded aluminum by pre-strain rolling: Limitation of the approach

This work emphasizes the limited efficiency of the pre-straining approach for suppression of abnormal grain growth in friction-stir welds produced at low-heat-input conditions. In this case, the introduced dislocation density is insufficient to overbalance grain-boundary energy. Hence, the subsequent annealing behavior is governed by the grain growth rather than recrystallization.

Automated summary

This study emphasizes that the pre-straining approach is not efficient in suppressing abnormal grain growth in friction-stir welds produced under low-heat-input conditions, as the introduced dislocation density is insufficient to overcome grain-boundary energy. Subsequent annealing behavior is mainly governed by grain growth rather than recrystallization.