镍基高温合金定向凝固过程中MC型碳化物的分形分析

FRACTAL ANALYSES OF MCIN A DIRECTIONALLY SOLIDIFIED NICKEL-BASE SUPERALLOY

利用分形物理分析的方法定量地描述了定向凝固过程中MC型碳化物的生长形态发现随着凝固速率的增加,MC由宽大的枝叶状演化为三级分支的枝簇状,其信息维数随凝固速率呈指数规律上升。

The growth morphologies of MC type carbide in a directional solidification was described quantitatively by means of the fractal analysis. The relationship between the in- formation dimensionality of MC evolved from the lenient branch-leaves into developed branch-cluster with the increase of the solidiflcation rate, and the information dimensionality of MC presented the exponential law with the change of solidification rate. In combination with the thermodynamic of nonequilibrium, the physical mechanism of MC morphology evo- lution was discussed when the controlled parameter-solidification rate changed.