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Phase transformation during annealing of rapidly solidified Al- rich Al- Fe- Si alloys

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Abstract

Thermal decomposition of rapidly solidified microstructure of three Al-Fe-Si alloys (Al-10,12, 14Fe-2Si wt pct) has been studied by DTA and TEM. The initial microstructure consists mostly of aluminum and a smaller volume fraction of an amorphous phase. During heating the amorphous phase first transforms to the metastable α(AlFeSi) cubic phase (Im\(\bar 3\),a = 1.25 nm) at ∼ 380°C. At higher temperature ∼ 430 °C the α(AlFeSi) phase transforms by ordering to a trigonal phase (two modifications, α′ and α ″,were found). The crystallography of the α′(AlFeSi) and α″(AlFeSi) phases is analyzed using selected area and convergent beam electron diffraction technique.

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Bendersky, L.A., McAlister, A.J. & Biancaniello, F.S. Phase transformation during annealing of rapidly solidified Al- rich Al- Fe- Si alloys. Metall Trans A 19, 2893–2900 (1988). https://doi.org/10.1007/BF02647715

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