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Production of net-shape Mn-Al permanent magnets by electron beam melting
Technische Universit at Darmstadt, Darmstadt, Germany.
Israel Institute of Metals, Technion R&D Foundation, Technion City, Haifa, Israel.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering. (Sports Tech Research Centre)ORCID iD: 0000-0003-2964-9500
Technische Universit at Darmstadt, Darmstadt, Germany.
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2019 (English)In: Additive Manufacturing, ISSN 2214-8604, Vol. 30, article id 100787Article in journal (Refereed) Published
Abstract [en]

The main goal of this work is the adoption of additive manufacturing for the production of inexpensive rare-earth free MnAl-based permanent magnets. The use of more advanced binder-free additive manufacturing technique such as Electron Beam Melting (EBM) allows obtaining fully-dense magnetic materials with advanced topology and complex shapes. We focus on the feasibility of controlling the phase formation in additively manufactured Mn-Al alloys by employing post-manufacturing heat treatment. The as-manufactured EBM samples contain 8% of the desired ferromagnetic τ-MnAl phase. After the optimized annealing treatment, the content of the τ-phase was increased to 90%. This sample has a coercivity value of 0.15 T, which is also the maximum achieved in conventionally produced binary MnAl magnets. Moreover, the EBM samples are fully dense and have the same density as the samples produced by conventional melting density. 

Place, publisher, year, edition, pages
2019. Vol. 30, article id 100787
Keywords [en]
Additive manufacturing, Electron beam melting, Mn-Al alloys, Permanent magnets, Printed magnets
Identifiers
URN: urn:nbn:se:miun:diva-37310DOI: 10.1016/j.addma.2019.100787Scopus ID: 2-s2.0-85072229290OAI: oai:DiVA.org:miun-37310DiVA, id: diva2:1353808
Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24Bibliographically approved

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Koptioug, Andrei

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