Abstract
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.
Highlights
Conventional aluminum alloys are widely used for good mechanical properties and relatively light weight
Samples in as-quenched state were analyzed by X-ray diffraction (XRD) to determine their state and phase composition
To qualify phase composition before and after these transformations, phase composition in as-cast state and evolution of phase composition with temperature was observed by in-situ XRD and transmission electron microscope (TEM)
Summary
Conventional aluminum alloys are widely used for good mechanical properties and relatively light weight. Enhancing these properties could be made by alloying aluminum with various elements such as silicon, which is reasonable choice in terms of sustaining light weight properties. Producing Al-Si alloy with higher silicon content cannot be achieved by conventional metallurgy. Only up to few weight percent of Si content has been attained in binary Al-Si alloys. It was found that increasing content of dissolved silicon is possible by adding other alloying components. Candidates with respect to low specific mass are transition elements of 4th period (from scandium to zinc). We have chosen to investigate rapidly quenched alloys of Al-Si with transition elements (T) iron, cobalt and nickel.
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