Evolution of Complex Phases in Al-Fe-Si Systems

Phase transformations and composition of Al-Fe-Si, Al-Co-Si and Al-Ni-Si based rapidly quenched ribbons have been investigated. Different Al-Si based alloys with varying Si content and additions of third metallic element, namely Al₈₀Si₂₀, Al₆₀Si₄₀, Al₇₅Fe₅Si₂₀, Al₇₀Fe₁₀Si₂₀, Al₇₅Co₅Si₂₀, Al₇₀Co₁₀Si₂₀, Al₇₅Ni₅Si₂₀, Al₇₀Ni₁₀Si₂₀ were analyzed. Variation of phase composition with elemental composition was observed. Evolution of phases was determined by resistometry, differential scanning calorimetry (DSC). In situ X-ray diffraction (XRD) and transmission electron microscope (TEM) records were observed during isothermal and isochronal annealing.

Keywords:
metallic glasses; planar flow casting; amorphous materials; aluminum-silicon alloys; nanocrystalline structure