An investigation into the influence of zirconium additions and processing conditions on Nd12.2Fe81.3B6.5 strip-cast material during the Hydrogen Ductilisation Process (HyDP).
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| Title: | An investigation into the influence of zirconium additions and processing conditions on Nd12.2Fe81.3B6.5 strip-cast material during the Hydrogen Ductilisation Process (HyDP). |
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| Authors: | Burkhardt, Fabian1 (AUTHOR), Brooks, Oliver Peter1 (AUTHOR) O.P.Brooks@bham.ac.uk, Harris, Ivor Rex1 (AUTHOR), Walton, Allan1 (AUTHOR) |
| Source: | Journal of Magnetism & Magnetic Materials. Jun2026, Vol. 648, pN.PAG-N.PAG. 1p. |
| Subjects: | Zirconium alloys, Ductility, Grain refinement, Magnetic properties, Phase transitions, Permanent magnets, Casting (Manufacturing process) |
| Abstract: | The Hydrogen Ductilisation Process (HyDP) is a novel production route which has the potential to form anisotropic NdFeB magnetic material with reduced manufacturing costs. HyDP utilises hydrogen-induced phase transformations to create ductility in normally brittle NdFeB alloys, enabling room-temperature deformation and offering a simplified alternative to the conventional sintering process. A key challenge in previous HyDP studies has been minimising the Nd 1 Fe 4 B 4 phase, which undergoes limited hydrogen-induced phase transformation, leaving brittle volumes in the microstructure which fractured during deformation. Additionally, redistribution of the grain boundary phase during HyDP led to cavitation, lowering material density. This study investigates the use of strip-cast NdFeB flakes alloyed with zirconium as a precursor for HyDP. The Zr-containing alloy formed a highly uniform microstructure, with a refined grain size, avoiding some limitation of previous studies and enabling full phase transformation with a shorter processing time. Furthermore, the refined grain structure promoted coarser disproportionated morphologies at higher hydrogen processing temperatures, which enhanced ductility and sample integrity during deformation. Following deformation, the desorption-recombination conditions fully restored the hard-magnetic phase, while the Zr additions suppressed the redistribution of the Nd-rich phase, reducing cavitation. The highest magnetic properties achieved were, Br ∼0.6 T in the x/y plane and coercivity, H cJ = 234 kA/m in the z-direction (deformation direction). However, alloys with 1 at.% Zr exhibited lower magnetic performance, due to ZrB 2 formation which created reverse-domain nucleation sites. This study highlights the potential of the HyDP process to be further developed to produce novel NdFeB magnets with a simpler, lower-energy manufacturing process. • HyDP created ductility in brittle strip cast alloys with Zr additions. • Zr addition increased coarsening in the disproportionated microstructures. • With increased coarsening, improved pressing behaviour is observed. • After recombination, with increased Zr addition reduced cavitation was observed. • Remanence increased with increased Zr content up to 0.5 at.%. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 193090329 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: An investigation into the influence of zirconium additions and processing conditions on Nd12.2Fe81.3B6.5 strip-cast material during the Hydrogen Ductilisation Process (HyDP). – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Burkhardt%2C+Fabian%22">Burkhardt, Fabian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Brooks%2C+Oliver+Peter%22">Brooks, Oliver Peter</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> O.P.Brooks@bham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Harris%2C+Ivor+Rex%22">Harris, Ivor Rex</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Walton%2C+Allan%22">Walton, Allan</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Jun2026, Vol. 648, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Zirconium+alloys%22">Zirconium alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Ductility%22">Ductility</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+refinement%22">Grain refinement</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Permanent+magnets%22">Permanent magnets</searchLink><br /><searchLink fieldCode="DE" term="%22Casting+%28Manufacturing+process%29%22">Casting (Manufacturing process)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Hydrogen Ductilisation Process (HyDP) is a novel production route which has the potential to form anisotropic NdFeB magnetic material with reduced manufacturing costs. HyDP utilises hydrogen-induced phase transformations to create ductility in normally brittle NdFeB alloys, enabling room-temperature deformation and offering a simplified alternative to the conventional sintering process. A key challenge in previous HyDP studies has been minimising the Nd 1 Fe 4 B 4 phase, which undergoes limited hydrogen-induced phase transformation, leaving brittle volumes in the microstructure which fractured during deformation. Additionally, redistribution of the grain boundary phase during HyDP led to cavitation, lowering material density. This study investigates the use of strip-cast NdFeB flakes alloyed with zirconium as a precursor for HyDP. The Zr-containing alloy formed a highly uniform microstructure, with a refined grain size, avoiding some limitation of previous studies and enabling full phase transformation with a shorter processing time. Furthermore, the refined grain structure promoted coarser disproportionated morphologies at higher hydrogen processing temperatures, which enhanced ductility and sample integrity during deformation. Following deformation, the desorption-recombination conditions fully restored the hard-magnetic phase, while the Zr additions suppressed the redistribution of the Nd-rich phase, reducing cavitation. The highest magnetic properties achieved were, Br ∼0.6 T in the x/y plane and coercivity, H cJ = 234 kA/m in the z-direction (deformation direction). However, alloys with 1 at.% Zr exhibited lower magnetic performance, due to ZrB 2 formation which created reverse-domain nucleation sites. This study highlights the potential of the HyDP process to be further developed to produce novel NdFeB magnets with a simpler, lower-energy manufacturing process. • HyDP created ductility in brittle strip cast alloys with Zr additions. • Zr addition increased coarsening in the disproportionated microstructures. • With increased coarsening, improved pressing behaviour is observed. • After recombination, with increased Zr addition reduced cavitation was observed. • Remanence increased with increased Zr content up to 0.5 at.%. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jmmm.2026.174084 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Zirconium alloys Type: general – SubjectFull: Ductility Type: general – SubjectFull: Grain refinement Type: general – SubjectFull: Magnetic properties Type: general – SubjectFull: Phase transitions Type: general – SubjectFull: Permanent magnets Type: general – SubjectFull: Casting (Manufacturing process) Type: general Titles: – TitleFull: An investigation into the influence of zirconium additions and processing conditions on Nd12.2Fe81.3B6.5 strip-cast material during the Hydrogen Ductilisation Process (HyDP). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Burkhardt, Fabian – PersonEntity: Name: NameFull: Brooks, Oliver Peter – PersonEntity: Name: NameFull: Harris, Ivor Rex – PersonEntity: Name: NameFull: Walton, Allan IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 03048853 Numbering: – Type: volume Value: 648 Titles: – TitleFull: Journal of Magnetism & Magnetic Materials Type: main |
| ResultId | 1 |
