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FE-SEM image of (a) Al–Cu powder prepared by ball milling and (b) high-magnification image of (a) with particles A and B labelled by dashed lines; (c) back scattered compositional image of Al–Cu powder; (d,e) FE-EPMA elemental mapping images for elements Al (d) and Cu (e); (f) XRD profile of Al–Cu powder.
