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TEM images of precipitations distribution at SZ of AZ31 alloy friction stir processed: (a) rotation speed of 1000 rpm—processing speed of 25 mm/min, (b) rotation speed of 5000 rpm—processing speed of 125 mm/min, and (c) AZ31 alloy unprocessed (Reprinted with permission from ref. [3]. Copyright 2020 Elsevier B.V.).
