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MM: Fachverband Metall- und Materialphysik

MM 5: Topical Session Interface Dominated Phenomena - Poster

MM 5.3: Poster

Dienstag, 28. September 2021, 10:00–12:45, P

Molecular Dynamics study of the influence of microstructure on reaction front propagation in Al-Ni multilayers — •Fabian Schwarz and Ralph Spolenak — Laboratory for Nanometallurgy, Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland

Reactive multilayers can be used for energy storage as well as releasing large amounts of heat in a short time. We use Molecular Dynamics (MD) simulations to study the influence of the crystal structure on the reaction front propagation in Al-Ni multilayers. Different microstructures, namely amorphous, single crystal, columnar grains and randomly oriented grains of varying size are investigated. The effect of the microstructure on the propagation speed is studied and compared to existing experimental results. Furthermore, MD simulations allow to study the inter-diffusion of the Al and Ni layers. We found that crystallinity has a significant impact on the front propagation speed, which is likely related to different diffusion mechanisms. The more disordered the individual layers become, e.g. by increasing the grain boundary density, the higher is the resulting propagation speed.