Abstract

Micro-blisters occurring on the surfaces of Al–Mg alloys after the first hot rolling pass were studied. The micro-blisters had a nanocrystyalline structure and comprised of an outer MgO shell and an inner Al/Al2O3 lining. It is proposed that the micro-blisters are linked to the presence of carbide particles protruding from the work roll surface and the evolution of hydrogen from the reaction of water vapor, permeated through the porous oxide-rich surface layer, with the bulk aluminum.

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