Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys

Kayitmazbatir, Metin; Lien, Huai-Hsun; Mazumder, Jyoti; Wang, Jian; Misra, Amit

doi:10.3390/cryst12050750

Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys

Journal Article · Mon May 23 00:00:00 EDT 2022 · Crystals

DOI:https://doi.org/10.3390/cryst12050750· OSTI ID:1869480

; Lien, Huai-Hsun; Mazumder, Jyoti; ; Misra, Amit

Laser Surface Remelting (LSR) was applied to arc-melted Al-20Si-0.2Sr, Al-20Si-0.2Ce, and Al-20Si hypereutectic alloys to refine microstructures. Experiments revealed that microstructures in the melt pool varied from fully eutectic to a mixture of Al dendrites and inter-dendritic eutectic. We calculated cooling rates using the Eagar-Tsai model and correlated cooling rates with characteristic microstructures, revealing that a cooling rate on the order of 104 K/s could lead to maximized fully eutectic microstructure morphology. Due to rapid solidification, the Si composition in the LSR eutectic was measured at 18.2 wt.%, higher than the equilibrium eutectic composition of 12.6 wt.%Si. Compared to Al-20Si, Ce addition had no significant effect on the volume fraction of the fully eutectic structure but refined Si fibers to approximately 30 nm in diameter. Sr addition did not further refine the diameter of eutectic Si fibers compared to Al-20Si but increased the volume fraction of the fully eutectic microstructure morphology. The refinement ratio (φ) of the Si fiber diameter from the bottom of the melt pool to the surface for the three alloys was similar, at around 28%. The established correlation between the cooling rate and the size and morphology of the microstructure within the melt pool will enable tailoring of the microstructure in laser-processed as well as deposited alloys for high strength and plasticity.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0016808

OSTI ID:: 1869480

Alternate ID(s):: OSTI ID: 1981117

Journal Information:: Crystals, Journal Name: Crystals Journal Issue: 5 Vol. 12; ISSN CRYSBC; ISSN 2073-4352

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Germany

Language:: English

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