Microstructural Study of Grain Boundary Cavitation during High Temperature Deformation of Al-4.5%Mg Alloy

Microstructural processes of the formation of grain boundary cavities during deformation of an A1-4.5 mass% Mg solid solution alloy at high temperatures (373-623 K) were discussed from a viewpoint of microstructure. Structural examination was carried out mostly at 533 K at which, under a strain rate of 2.7×10 -5 s -1 , the ductility (the reduction in area at fracture) took a minimum value (-48%) and the mode of fracture was intergranular because of severe grain boundary cavitation

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