Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 10: Poster Session 1

MM 10.10: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Atom probe tomography study of diffusion in Al-TiB2 and Al3Ta-TiB2 systems — •Evgeniia Volobueva, Patrick Stender, Jiehua Li, and Guido Schmitz — University of Stuttgart, Institute of Material Science , Heisenbergstr. 3, 70569, Stuttgart, Germany

To improve the quality of castings, grain refinement is a technique that can improve the overall qualities and properties of the material. For grain refinement in aluminum casting processes, TiB2 and Ta are added. It is well known, that Al and Ta form an Al3Ta phase inside the Al-based alloy. In order to gain insight into the process of grain refinement, the diffusion of Al3Ta and Al in TiB2 crystals was analyzed via Atom Probe Tomography (APT) in detail.

In this project, single crystals of TiB2 were used as raw material, glued on top of tungsten posts. Both pure aluminum layers and stoichiometric Al3Ta layers were deposited by sputter deposition on these crystals with a layer thickness of 200 nm. Subsequent annealing treatments were carried out to investigate segregation and diffusion phenomena at the crystal interface. To use the high spatial and chemical resolution of APT, the samples were sharpened to a final apex radius of 50 nm by azimuthal milling using a Focused Ion Beam Instrument (FIB). Observed segregation and determined diffusion coefficients will be presented.