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- W4205659567 abstract "Different Ta concentrations together with stochiometric grain refiner (Al-2.2Ti-1B) in Al-Si-Mg based alloys were investigated with the aim to elucidate grain refinement mechanisms. Post-solidification microstructure was characterised using optical microscopy and scanning electron microscopy (SEM), with a special focus on the Ta-rich layer (more likely to be Al 3 Ta) on the basal planes (0001) of TiB 2 . A significant grain refinement was observed by using the solute Ta together with stochiometric grain refiner (Al-2.2Ti-1B). In order to further elucidate the formation of Ta-rich layer on the basal planes (0001) of TiB 2 , the Density Functional Theory (DFT) calculation were also performed to determine the interface energies of different interfaces and sandwich configurations, including Al (111), Al 3 Ti (112) and Al 3 Ta (112) at the interface of TiB 2 basal plane (0001). It was found that the interface energy for Ti-terminated TiB 2 at the interface throughout all configurations involved in this paper is lower than that for B-terminated TiB 2 , indicating that Ti-terminated TiB 2 is more favourable. It was also found that the Al 3 Ta configuration yields the same interface energies as the Al 3 Ti configuration. Furthermore, the interface energy of the sandwich configuration also shows nearly identical values along the TiB 2 // Al 3 Ti and TiB 2 // Al 3 Ta interface energy, strongly indicating that the solute Ti can be fully replaced by the solute Ta." @default.
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- W4205659567 date "2022-01-10" @default.
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- W4205659567 title "Effect of Solute Ta on Grain Refinement of Al-7Si-0.3Mg Based Alloys" @default.
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- W4205659567 doi "https://doi.org/10.4028/www.scientific.net/ssp.327.54" @default.
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