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Structural, microstructural and magnetic evolution in cryo milled carbon doped MnAl
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0003-0336-2560
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 2525Article in journal (Refereed) Published
Abstract [en]

The low cost, rare earth free τ-phase of MnAl has high potential to partially replace bonded Nd2Fe14B rare earth permanent magnets. However, the τ-phase is metastable and it is experimentally difficult to obtain powders suitable for the permanent magnet alignment process, which requires the fine powders to have an appropriate microstructure and high τ-phase purity. In this work, a new method to make high purity τ-phase fne powders is presented. A high purity τ-phase Mn0.55Al0.45C0.02 alloy was synthesized by the drop synthesis method. The drop synthesized material was subjected to cryo milling and followed by a fash heating process. The crystal structure and microstructure of the drop synthesized, cryo milled and flash heated samples were studied by X-ray in situ powder diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy and electron backscatter diffraction. Magnetic properties and magnetic structure of the drop synthesized, cryo milled, flash heated samples were characterized by magnetometry and neutron powder diffraction, respectively. The results reveal that the 2 and 4hours cryo milled and flash heated samples both exhibit high τ-phase purity and micron-sized round particle shapes. Moreover, the fash heated samples display high saturation magnetization as well as increased coercivity.

Place, publisher, year, edition, pages
2018. Vol. 8, no 1, article id 2525
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Materials Chemistry Engineering and Technology
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URN: urn:nbn:se:uu:diva-341024DOI: 10.1038/s41598-018-20606-8ISI: 000424189500012PubMedID: 29410462OAI: oai:DiVA.org:uu-341024DiVA, id: diva2:1180632
Funder
Swedish Energy AgencySweGRIDS - Swedish Centre for Smart Grids and Energy StorageSwedish Research CouncilAvailable from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-04-17Bibliographically approved

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Fang, HailiangCedervall, JohanHedlund, DanielShafeie, Samrandvon Fieandt, LinusSvedlindh, PeterGunnarsson, KlasSahlberg, Martin
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