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The fractal characteristics of dendrite and cellular structure of nickel-based superalloy K5 are investigated under directional solidification. Results show that the fractal dimension of the dendrite increases from 1.228 to 1.418 as the withdraw speeds change from 40 to 264μm/s, whereas the fractal dimension of the cellular changes little as the withdraw speeds from 600 to 952μm/s. The physical significance...
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