Development of Novel Nano - Single Si Phase Cast Hypereutectic Al-Si Alloys
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![Figure 1. Aluminum-Silicon equilibrium phase diagram and chemical compositions for the a-hypoeutectic (from 1.65 wt.%Si to 12.6 wt.%Si), b-eutectic (12.6 wt.%Si), c-hypereutectic (> 12.6 wt.%Si) phases [2], [3]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/48.612.115.529.328.608/aluminum-silicon-equilibrium-chemical-compositions-hypoeutectic-eutectic-hypereutectic.webp)
![Figure 5. a) SEM deep etched Star-like dendritic morphology of primary silicon [57], [58]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/61.612.234.422.391.579/figure-sem-etched-star-dendritic-morphology-primary-silicon.webp)
![Figure 12. SEM micrograph of dendrite Silicon morphology, the Al-50 at.%Si droplet solidified at the onset of undercooling at 10 ○C [69]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/65.612.281.428.384.532/figure-micrograph-dendrite-silicon-morphology-droplet-solidified-undercooling.webp)
![Figure 18. SEM microstructure showing nano blocky primary silicon crystals, which grow like primary silicon in the 0.15 wt.%Sr modified hypereutectic Al-20Si-3Cu alloy, solidified at a MCR of ≈ 400 ○C/s [78]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/71.612.202.450.85.318/figure-microstructure-silicon-crystals-silicon-modified-hypereutectic-solidified.webp)
![Figure 22. LOM micrographs for the hypereutectic Al-18Si alloy, a) re-melted and cast without melt treatment, b) treated with 0.2 wt.%SrCl2 [83]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/79.612.235.430.510.658/figure-micrographs-hypereutectic-alloy-melted-treatment-treated-srcl.webp)
![Figure 32. SEM micrographs of the morphology of the Al-13Si, a) without the Thermal Rate Treatment, b) with the Thermal Rate Treatment [50]](https://thumb-us.123doks.com/thumbv2/123dok_us/1396487.1172346/87.612.247.400.510.655/figure-micrographs-morphology-thermal-rate-treatment-thermal-treatment.webp)
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