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HomeSolid State PhenomenaSolid State Phenomena Vol. 327Effect of Solute Ta on Grain Refinement of...

Effect of Solute Ta on Grain Refinement of Al-7Si-0.3Mg Based Alloys

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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 Al₃Ta) on the basal planes (0001) of TiB₂. 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 TiB₂, the Density Functional Theory (DFT) calculation were also performed to determine the interface energies of different interfaces and sandwich configurations, including Al (111), Al₃Ti (112) and Al₃Ta (112) at the interface of TiB₂ basal plane (0001). It was found that the interface energy for Ti-terminated TiB₂ at the interface throughout all configurations involved in this paper is lower than that for B-terminated TiB₂, indicating that Ti-terminated TiB₂ is more favourable. It was also found that the Al₃Ta configuration yields the same interface energies as the Al₃Ti configuration. Furthermore, the interface energy of the sandwich configuration also shows nearly identical values along the TiB₂ // Al₃Ti and TiB₂ // Al₃Ta interface energy, strongly indicating that the solute Ti can be fully replaced by the solute Ta.

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Semi-Solid of Alloys and Composites XVI

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Periodical:

Solid State Phenomena (Volume 327)

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54-64

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https://doi.org/10.4028/www.scientific.net/SSP.327.54

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Online since:

January 2022

Authors:

Ivo Spacil, David Holec, Peter Schumacher, Jie Hua Li*

Keywords:

Al-Si-Mg Alloy, DFT, Grain Refinement, Nucleation, Ta, TiB₂

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