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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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Leonowicz, Marcin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2023How to control the crystallization of metallic glasses during laser powder bed fusion? Towards part-specific 3D printing of in situ compositescitations
- 2022How to Control the Crystallization of Metallic Glasses During Laser Powder Bed Fusion? Towards Part-Specific 3d Printing of in Situ Composites
- 2021Ultrashort Sintering and Near Net Shaping of Zr-Based AMZ4 Bulk Metallic Glasscitations
- 2020Impact of the Carbon Nanofillers Addition on Rheology and Absorption Ability of Composite Shear Thickening Fluidscitations
- 2019Rheological properties and stability of shear thickening fluids based on silica and polypropylene glycolcitations
- 2019New approach to amorphization of alloys with low glass forming ability via selective laser meltingcitations
- 2019Monitoring of the hydrogen decrepitation process by acoustic emissioncitations
- 2017Thermodynamic Assessment of the Fe-B System in the Ssol5 and User Databasescitations
- 2017Consolidation of Nanocrystalline Nd-Fe-B Powder by Hydrostatic Extrusion at High Temperaturecitations
- 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
- 2011Hard Magnetic, Low Neodymium Nd‐Fe‐B Melt‐Spun Alloys Containing Refractory Metalscitations
- 2010Lean neodymium Nd–Fe–B magnets containing minor addition of titaniumcitations
- 2008Effect of milling medium on the structure and magnetic properties of mechanically alloyed barium ferrite
- 2008Intermatrix Synthesis of Magnetic Nanocrystals by Frontal Polymerization and Subsequent Pyrolysis of Iron Containing Monomercitations
- 2008Influence of chemical composition on phase constitution and magnetic properties of magnets processed by devitrification of BaO-Fe<inf>2</inf>O<inf>3</inf>-B<inf>2</inf>O<inf>3</inf>glasses
- 2008Improvement of the magnetic properties of low-neodymium magnets by minor addition of titaniumcitations
- 2008Effect of processing parameters on the structure and magnetic properties of Nd60Fe30Al10 alloycitations
- 2008Structure and Magnetic Properties of Low Neodymium Magnets Containing Minor Addition of Molybdenum
- 2006Modification of the properties of Ni-Mn-Ga magnetic shape memory alloys by minor addition of terbiumcitations
- 2006Effect of the processing conditions on the microstructure of urethane magnetorheological elastomerscitations
- 2004Functional Polymer Matrix Fibers
- 2002NdFeB-αFe nanocomposites containing small additions of Pbcitations
- 2001Microstructure and magnetic properties of the Sm-Fe-N magnets produced by different methods
- 2001Magnetization processes in Sm-Fe N / α-Fe nanocomposities
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article
Consolidation of Nanocrystalline Nd-Fe-B Powder by Hydrostatic Extrusion at High Temperature
Abstract
Hydrostatic extrusion is a modern method of shaping material microstructure and properties. Hydrostatic extrusion can also be successfully used for consolidation of hard magnetic powders. The effect of extrusion temperature, within the range of 700-800°C, on the magnetic properties of the bulk, final product was studied. A commercial MQU-F42 powder, dedicated to hot pressing, was placed in copper capsules and initially cold compacted up to 60% of the theoretical density. Subsequently, the billet was heated in an oven to temperatures 700 and 800°C, respectively and subjected to hydrostatic extrusion. The extruded product had a form of a copper rod, with the Nd-Fe-B core, having 96% of theoretical density (true strain 1.85 after extrusion at 800°C). The extrusion process led to deterioration of the coercivity, for which coarsening of the Nd₂Fe₁₄B grains was blamed. In order to prove this hypothesis, the starting powder was annealed in a temperature range of 550-900°C for various times. The crystallite size, measured after annealing by the X-ray diffraction method, showed that with extension of time and elevation of the temperature the crystallite size increases, however the dominating parameter is the temperature. Correlation of the crystallite size with temperature indicates that when the crystallites are larger than 80 nm the magnetic properties dramatically decrease. Additionally, after HE at 800°C micrometric size Nd-rich phase appear in the microstructure. The Nd is squeezed from the grain boundary of the Nd₂Fe₁₄B phase leading to non-isolated grains, which also contributes to the deterioration of the coercivity.