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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Michalski, Bartosz
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2022In situ alloying of NiTi: Influence of laser powder bed fusion (LBPF) scanning strategy on chemical compositioncitations
- 2022Heat Treatment of NiTi Alloys Fabricated Using Laser Powder Bed Fusion (LPBF) from Elementally Blended Powderscitations
- 2021Effect of severe deformation on the microstructure and properties of Nd-Fe-B powders caused by hydrostatic extrusioncitations
- 2019Monitoring of the hydrogen decrepitation process by acoustic emissioncitations
- 2019Effect of silver content in Zr<inf>55</inf>Cu<inf>30</inf>Ni<inf>5</inf>Al<inf>10−x</inf>Ag<inf>X</inf> alloys on the supercooled liquid stability analysed by TTT diagrams
- 2017Complex Characteristics of Sintered Nd–Fe–B Magnets in Terms of Hydrogen Based Recyclingcitations
- 2016Hydrogen disproportionation phase diagram and magnetic properties for Nd<inf>15</inf>Fe<inf>79</inf>B<inf>6</inf> alloycitations
- 2013Effect of microstructure changes on magnetic properties of spark plasma sintered Nd-Fe-B powderscitations
- 2012Processing the Nd-Fe-B powders by high temperature millingcitations
- 2012Magnetic properties of Nd 12Fe 82B 6 and Nd 14Fe 80B 6 powders obtained by high temperature milling
- 2011Characterization of nanostructured Nd-Fe-Al permanent magnetscitations
- 2011Correlation between the size of Nd<inf>60</inf>Fe<inf>30</inf>Al <inf>10</inf> sample, cast by various techniques and its coercivity
- 2008Effect of processing parameters on the structure and magnetic properties of Nd60Fe30Al10 alloycitations
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article
Effect of severe deformation on the microstructure and properties of Nd-Fe-B powders caused by hydrostatic extrusion
Abstract
The commercial Nd-Fe-B (Magnequentch MQU-F42) powder was consolidated by hydrostatic extrusion at room temperature in three stages. The values of thru strain obtained after the stages, were 1.38, 2.27, 3.12. A high degree of deformation leads to local changes occurring in the microstructure of the material that negatively affects its magnetic properties. Mossbauer spectroscopy has shown that a new phase appears in the deformed material, most probably as a result of strong local defecting (amorphization) of the Nd2Fe14B phase. Rietveld analysis of the diffraction phase investigation results indicates that deformation leads to a clear fragmentation of the material grain and to the deformation (change of parameters) of the crystal lattice. The heating of deformed materials leads to a series of irreversible transformations that start at a temperature of about 200 °C. As a result, α-Fe is produced from the defected phase in the form of 3 nm crystallites. The release of free Fe changes the chemical composition of the 'defected phase', making it impossible for it to revert to the structure prior to deformation. It can be concluded that the structural changes occurring in Nd-Fe-B powders during severe deformation are irreversible and involve a permanent reduction in the magnetic properties of the material.