本文测量了7475高强Al合金超塑变形时,不同应变、不同温度、不同应变速率、不同晶粒尺寸时空洞分形维数的变化。由此得出:空洞的分形维数随应变的增加而增加,在低的变形温度。高的应变速率及粗的晶粒尺寸条件下对应空洞的分形维数较高。空洞的分形维数越高,则材料越接近于破断。
The fractal dimension changes of cavities have been determined duringsuperplastic deformation of the high strength Al alloy 7475 with different strain,temperature, strain rate and grain size. The fractal dimension of cavities may in-crease with the increase of strain. It becomes higher as the alloy deformed underthe lower temperature, the greater strain rate and the coarser grain size. The alloywould be approaching to rupture if the fractal dimension of cavities raised to acertain extent.
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