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(a) SEM images of the MPBs in SLM samples in a section plane: (a) the cross section of low magnification morphology of the MPBs at the build direction; (b) SEM image of the morphology of “track–track” MPBs; (c) high magnification of morphologies of “layer–layer” MPBs; (d) the distribution of elements near MPB on the A–B line.
