Abstract
Metal-bonded magnetic composites (MBMCs) present a promising alternative to dense sintered magnets, particularly for intricate components. Compared to polymer-based bonded magnets, MBMCs have wider applicability in harsh environments. In this paper, we demonstrate a solid-state shear-based manufacturing technique to introduce localized magnetization into a paramagnetic aluminum matrix by embedding SmCo5 permanent magnet particles. Our magnetic composites display hard magnetic behavior with a coercivity of 13 kOe and a remanent magnetization of 4.32 emu/g. In addition to magnetization, we also report a 9% improvement in Young’s modulus. Despite the local temperature rise during processing, the magnetic phases didn’t decompose into unwanted phases, preserving the composite’s hard magnetic properties. Creation of an interfacial metallurgical bond with the matrix ensured the suitability of the composites for structural applications. Our study investigates the mechanical, and functional properties of composites, paving the way for lightweight structural magnetic composites with a transformative potential in the aerospace, nuclear, and automotive applications. This work underscores the potential for further optimization and development to drive innovations in magnet and equipment design.
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Acknowledgements
The research is supported by ONR under grant N00014-23-1-2758 and was performed at the Center for Additive Manufacturing and Logistics (CAMAL) of North Carolina State University. The microstructural characterization was performed at the Analytical Instrumentation Facility (AIF) at North Carolina State University, which is supported by the State of North Carolina and the National Science Foundation (award number ECCS-2025064). The AIF is a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), a site in the National Nanotechnology Coordinated Infrastructure (NNCI). The authors acknowledge the Manufacturing Technology Inc. friction stir processing facility available at the Center for Friction Stir Processing (CFSP) at the University of North Texas. The authors are very grateful to Anurag Gumaste at the University of North Texas for helping with the friction-stir experiments. ME acknowledges support from U.S. DOE, Vehicle Technologies Office, through the Powertrain Materials Core Program. Pacific Northwest National Laboratory is operated by Battelle for the U.S. Department of Energy (DOE) under contract DE-AC05-76RL01830.
Funding
Office of Naval Research Global, N00014-23-1-2758, Bharat Gwalani, National Science Foundation, ECCS-2025064.
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Ishrak, F., Lastovich, M., Malakar, A. et al. Aluminum/SmCo5 composites for structural and magnetic applications. J Mater Sci (2024). https://doi.org/10.1007/s10853-024-10208-3
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DOI: https://doi.org/10.1007/s10853-024-10208-3