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An Experimental Study of Cavity Nucleation During Superplastic Deformation

  • Jiang Xinggang (a1), Cui Jianzhong (a1) and Ma Longxiang (a1)

Abstract

Cavity nucleation during superplastic deformation of a high strength aluminium alloy has been studied using a high voltage electron microscope and an optical microscope. The results show that cavities nucleation is due only to superplastic deformation and not to pre-existing microvoids which may be introduced during thermomechanical processing. The main reason for cavity nucleation is the high stress concentration at discontinuties in the plane of the grain boundary due to grain boundary sliding.

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