In situ study of nucleation and growth of the irregular alpha-Al/beta-Al5FeSi eutectic by 3-D synchrotron X-ray microtomography
- Terzi, S.
- Taylor, J.A.
- Cho, Y.
- Salvo, L.
- Suery, M.
- Boller, E.
- Dahle, A.K.
DOIAbstract
International audienceIn order to better understand the formation of beta-Al5FeSi intermetallic plates during solidification of Al-Si casting alloys, an Al-8% Si-4% Cu-0.8% Fe alloy has been studied by in situ microtomography using high-energy X-rays in the synchrotron. After formation of the aluminium dendrites, the beta phase forms as an irregular eutectic together with eutectic alpha-Al. Only four plates were nucleated in the sample, and all nucleated in the very early stage of the eutectic reaction and subsequently developed into complex connected three-dimensional plates. The plates display very rapid lateral growth and slow thickening, which, together with the observation of imprints of dendrites and ridges in the plates, suggest a ve...
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