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Microstructure of AZ91 alloy friction stir processed: (a) OM image of various zones, (b) SEM image of various zones, (c) SEM image of center of SZ, (d) OM image of TMAZ, and (e,f) SEM images of SZ at higher magnification (Reprinted with permission from ref. [15]. Copyright 2020 Elsevier B.V.).
