NEW CAVITY GROWTH RATE EQUATION IN

SUPERPLASTIC DEFORMATION

Jiang Xinggang  Cui Jianzhong 

(University of Science and Technology Beijing)

Ma Longxiang

(Northeast University of Technology)

Abstract: A new cavity growth formula considering cavity interlinkage was proposed in this paper. The relationship between η, V f , r and dr/dε is first shown in the new formula during superplastie deformation. The new cavity growth formula has a wider application than reported before which did not consider the interlinkage of cavities during deformation. The prediction of the cavity growth rate is consistent with the results of the cavity growth bebavior of 7475Al alloy during superplastic deformation.
Key words: Cavity  Superplastic deformation  Cavity interlinkage  7475Al
Received 19910921, received in revised form 19920907