The effect of Cu-based core-sheath configurations on the processing of Nd-Fe-B-based permanent magnets via equal-channel angular pressing

L Besley, H Zhang, A. Molotnikov, Hidefumi Kishimoto, Takahiro A Kato, C. Davies, K. Suzuki

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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Equal channel angular pressing (ECAP) has been used as an alternative manufacturing route for preparation of Nd2Fe14B-based anisotropic magnets, facilitating processing temperatures much lower than conventional die upsetting. While this method can produce a suitable texture and microstructure in permanent magnetic materials, it still remains novel; involving extremely high pressures which present a high risk of both process failure and die and tooling damage. Powder metallurgical processes frequently incorporate an external layer of secondary material (commonly an outer foil layer or can) for separation between the primary material and die as well as the control of surface effects such as friction through appropriate choice of secondary material. This work implements such modifications to this manufacturing route by incorporation of an outer layer of Cu foil, the addition of which negatively affected both the powder compaction and strength of texture produced via ECAP. Also investigated was the incorporation of solid Cu bar as part of the sample cross section. This modification facilitated processing without any compromise on observed magnetic properties, whilst also reducing damage to both the die and tooling. This type of methodology may aid in improving the reliability of producing bulk anisotropic permanent magnets via ECAP.

Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
Subtitle of host publication7th International Conference on Nanomaterials by Severe Plastic Deformation, 2–7 July 2017, Sydney, Australia
Editors Yuri Estrin, Xiaozhou Liao
Number of pages6
Publication statusPublished - 8 May 2017
EventInternational Conference on Nanomaterials by Severe Plastic Deformation 2017 - Sydney, Australia
Duration: 2 Jul 20177 Jul 2017
Conference number: 7th

Publication series

NameIOP Conference Series: Materials Science and Engineering
PublisherInstitute of Physics Publishing Ltd.
ISSN (Print)1757-8981
ISSN (Electronic)1757-899X


ConferenceInternational Conference on Nanomaterials by Severe Plastic Deformation 2017
Abbreviated titleNanoSPD7 2017
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