FRACTAL DIMENSION OF SHAPE CHANGE OF CAVITIFS DURING SUPERPLASTIC DEFORMATION IN HIGH STRENGTH Al ALLOY

Abstract

Abstract: The fractal dimension changes of cavities have been determined during superplastic deformation of the high strength aluminiurn alloy 7475 with different strain,temperature, strain rate and grain size.The fractal dimension of cavities may increase with the increase of strain.It becomes higher as the alloy deformed under lower temperatures,greater strain rate and coarser grain size.The alloy would be approaching to rupture if the fractal dimension of cavities raised to a certain extent.

Key words: fractal dimension, superplastic deformation, cavity, Al alloy

JIANG Xinggang CUI Jianzhong MA Longxiang Northeast University of Technology,Shenyang,China. FRACTAL DIMENSION OF SHAPE CHANGE OF CAVITIFS DURING SUPERPLASTIC DEFORMATION IN HIGH STRENGTH Al ALLOY[J]. Acta Metallurgica Sinica (English Letters), 1991, 4(7): 55-58.

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FRACTAL DIMENSION OF SHAPE CHANGE OF CAVITIFS DURING SUPERPLASTIC DEFORMATION IN HIGH STRENGTH Al ALLOY

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