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Eutectic α-Fe2Si5 and ε-FeSi Formed in an Arc Furnace Showed a Three-Layer Structure

We melted stiochiometrically mixed (FeSi2) Fe and Si powders in a tri-arc furnace in an argon atmosphere and allowed them to cool naturally to room temperature and obtained a eutectic crystal of ε-phase embedded in α-phase of iron silicide. We determined three kinds of layers: the grain size of ε-phase was more than 100 µm, about 50 µm and less than 1 µm. Only the first layer did not contain α-phase. The interfaces between the layers were so definite that the grain size was changed abruptly between the layers. When the crystal was annealed in vacuum at 1150 K for 70 h, the last two layers were transformed to β-FeSi2 but the bottom layer containing only ε-phase was not changed by the thermal treatment.