Abstract
Fine crystallinity may improve the figure of merit of iron disilicide-based thermoelectric materials. Manganese doped iron disilicide based alloys with the chemical composition of Fe 1.92Mn 0.08Si 5 have been prepared by rapid solidification and hot uniaxial pressing (HUP), and the microstructure development during the preparation has been studied. Textures have been found in the annealed samples hot-pressed from the melt spun ribbon powders. Large polyhedral silicon grains with a size of about 2 μm and small silicon rods about 200 nm in diameter have been observed in the annealed samples, which are considered to be formed during HUP at about 900 °C and annealing at 800 °C, respectively.
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