抄録
The relation between lamellar spacing λ and growth rate v has been studied from the energetic considerations for the lamellar eutectic growth. Three free energy sinks were considered; namely, the kinetic process for solidification, diffusion and solid phase boundary formation. The free energy for the kinetic process was estimated to be less than that for the formation of phase boundary. The free energy necessary for the diffusion process can be calculated by the use of the principle of irreversible thermodynamics. By obtaining the λ value which minimizes the rate of free energy supply necessary for the growth of lamellar structure, the relation λ2v=const. is given for the case where the diffusion occurs in the liquid, and λ3v=const. for the case where the diftusion is restricted in the boundary layer between solid and liquid. The constants in these relations are less complicated than those obtained by other methods and are advantageous for the numerical calculations based on them.
