Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Computational Materials Modelling: HEA, Alloys & Nanostructures
MM 20.5: Talk
Wednesday, September 7, 2022, 11:15–11:30, H44
In-situ Nanoalloying by Laser Powder Bed Fusion: Molecular Dynamics Simulations of Cantor-Alloy Formation in a Powder Blend — •Yulia Klunnikova1, Arne J. Klomp2, and Karsten Albe3 — 1klunnikova@mm.tu-darmstadt.de — 2klomp@mm.tu-darmstadt.de — 3albe@mm.tu-darmstadt.de
Laser powder bed fusion (LPBF) is an additive manufacturing technology involving a gradual build-on of layers to form a complete component typically starting with prealloyed particles. Alternatively, one can also start with a power blend and initiate in-situ alloying by the laser beam. In this context, multi-component systems, including high entropy alloys, are of particular interest. In this contribution we show results of molecular dynamics simulations of high-entropy nanoalloys formed by LBPF. We use the Cantor alloy as model system and explore the possibility to create the FeCrCoMnNi alloy from powder blends under far-from-equilibrium conditions and compare to the case of pre-alloyed nanopowders. By varying parameters (temperature field, melt pool, substrate type, etc.) we explore the correlation to microstructural features. In the case of the powder blend the elemental components mix in the liquid phase and solidify partially in crystalline and glassy states. Depending on the parameters of the laser (irradiation temperature, laser spot size) we see varying amounts of crystal defect, such as stacking faults, twinning, and vacancies. The results show that the resulting structures are delicately depending on the interplay of laser parameters, heat transport, interdiffusion and geometric factors. We acknowledge the NHR4CES for the computing time.