The solid/liquid interface of a directionally solidified Ni-base superalloy with different phosphorus contents was quantitatively described by means of fractat method.When the solidification rate was fixed,the relationship between the fractal dimensionality of the solid/liquid interface and the phos- phorus content of the test alloy was given.Combined the thermodynamics and fractal theory,the ef- fect mechanism of phosphorus content on fractal dimensionality of the solid/liquid interface was discussed.
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