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BFLM micrographs of the Cu side of (a) A1, (b) B2, (c) C3, (d) D4, and (e) E5 Al/Cu joints taken in the inner peripheral region within the 50 to 100 µm wide area adjacent to the Al/Cu interface. White arrows indicate small equiaxed recrystallized Cu grains. Black arrows depict deformed regions. Orange arrows indicate the DRZ/TMAZ boundary. Green arrows indicate the TMAZ/BM boundary.
