Abstract
Dilute Al–Fe–Si alloys with Fe/Si weight ratios of 2 and 4, which had been subjected to solidification rates of ∼1 and ∼10 Ks−1 were investigated by analytical transmission electron microscopy. The precipitation of ‘constituent’ intermetallic phases was characterized as a function of the Fe/Si ratio, alloy purity, rate of solidification, and heat treatment at 600°C. A range of phases, including three new ones (AlpFe, q1-AlFeSi, and q2-AlFeSi), were identified for each experimental condition. The crystal structures of the phases were determined by electron diffraction, and their compositions obtained by scanning transmission electron microscopy and energy dispersive X-ray analysis.
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