Abstract
Al 70Fe 13Si 17 alloys were melt-spun with commercial grain refiner additions containing TiB 2 and Al 3Ti particles. X-ray diffraction, calorimetry and transmission electron microscopy revealed incomplete vitrification. The size and number density of Al crystals increased with decreasing quench rate. Full crystallisation led to formation of β-Al 9FeSi 2 and Al. In as-quenched samples nucleation events on TiB 2 particles were surrounded by nanocrystalline α-Al particles embedded in amorphous phase. Boride particles were covered in a thin Ti-containing layer and surrounded by a featureless zone reminiscent of a peritectic reaction and they exhibited an orientation relationship to next neighbour Al particles.
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