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Fractal Characterization of Cavity Shape Changes During Superplastic Deformation of High Strength Aluminium Alloy 7475

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


The fractal dimensions of cavities during superplastic deformation of high strength aluminium alloy 7475 were measured with different strain, temperature, strain rate, and grain size. The results show that the fractal dimension of cavities increases with the increase of strain. Deformation under lower temperature, higher strain rates, or for larger grain sizes corresponds to higher fractal dimensions of cavities. The higher the fractal dimension of cavities, the more complex the cavities' shapes and the more possible it is for the specimen to rupture.



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