extremely fine, eutectics, rod-like, and massive primary silicon particles are buried (Figs. 9(e)-(f)). During melting and solidification, rate of formation of ridges in silicon particles increased with a high melting point (1430°C) on the EDMed surface, due to the difference between the melting point of the a-phase and that of the silicon phase. The X- ray analysis of Fig. 10 proves that the amount of silicon near the ridges formed in resolidification markedly increased with silicon content.