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Influence of heat treatment on fracture and magnetic properties of radially oriented Sm 2 Co 17 permanent magnets
Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.
Institute of Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology, Beijing.ORCID iD: 0000-0003-4888-6237
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2007 (English)In: Transactions of Nonferrous Metals Society of China, ISSN 1003-6326, E-ISSN 2210-3384, Vol. 17, no 3, p. 491-495Article in journal (Refereed) Published
Abstract [en]

The quenching, fracture and aging treatment of radially oriented Sm2Co17 ring magnets were investigated. The results indicate that the ring magnets have obvious anisotropy of thermal expansion, which easily leads to the splits of the magnets during quenching. The fracture is brittle cleavage fracture. The difference (δa) of the expansion coefficient reaches the maximum value at 800–850 °C. So, various quenching processes at different steps are adopted in order to reduce the splits. When the magnets are aged. 1:5 phase precipitates from the 2:17 matrix phase and forms a cellular microstructure with 2:17 phase. BHmax and 3Hc reach the maximum value 226 kJ/m3 and 2170 kA/m after being aged at 850 °C for 4 h and 8 h, respectively. The aging treatment at 850 °C has little influence on remanence(Br), which can always keep a high value (≥1.0 T). Through appropriate heat treatment, the ring magnets have uniform cellular microstructure and excellent magnetic properties: Br1.0T, 3Hc≥2 100 kA/m, BHmax≥220 kJ/m3.

Place, publisher, year, edition, pages
2007. Vol. 17, no 3, p. 491-495
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Other Materials Engineering
Research subject
Engineering Materials
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URN: urn:nbn:se:ltu:diva-6664DOI: 10.1016/S1003-6326(07)60121-6Local ID: 4ed3c7de-d118-4e84-a718-6916433cdd03OAI: oai:DiVA.org:ltu-6664DiVA, id: diva2:979550
Note
Upprättat; 2007; 20150416 (farakh)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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