Magnetic Properties of Ternary Fe–Ni–Ti Alloys After Severe Plastic Deformation

Taskaev, S.; Ulyanov, Maxim; Gunderov, D. V.

doi:10.1109/lmag.2020.2993133

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…For example, the synthetization of L10-FeNi tetrataenite during HPT-deformation and subsequent annealing has been studied in. [81][82][83][84][85][86][87] Up to now, the only successful L10-FeNi phase formation using HPT-deformation has been reported in. [85][86][87] Additionally, the various defects introduced by HPT can act as pinning sites in hard magnetic materials, hindering domain wall movement and change the magnetization reversal process from nucleation to a pinning dominated one.…”

Section: High-pressure Torsion Of Bulk Magnetic Materialsmentioning

confidence: 99%

Magnetic Materials via High-Pressure Torsion of Powders

et al. 2023

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Magnets are key materials for the electrification of mobility and also for the generation and transformation of electric energy. Research and development in recent decades lead to high performance magnets, which require a finely tuned microstructure to serve applications with ever increasing requirements. Besides optimizing already known materials and the search on novel material combinations, an increasing interest in unconventional processing techniques and the utilization of magnetic concepts is apparent. Severe plastic deformation (SPD), in particular by high-pressure torsion (HPT) is a versatile and suitable method to manufacture microstructures not attained so far, but entitling different magnetic coupling mechanisms fostering magnetic properties. In this work, we review recent achievements obtained by HPT on soft and hard magnetic materials, focusing on powder as starting materials. Furthermore, we give specific attention to the formation of magnetic composites and highlight the opportunities of powder starting materials for HPT to exploit magnetic interaction mechanism.

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Section: High-pressure Torsion Of Bulk Magnetic Materialsmentioning

confidence: 99%

Magnetic Materials via High-Pressure Torsion of Powders

et al. 2023

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“…A high-density of lattice defects is introduced inside the sample by severe deformation, which leads to enhanced atomic diffusion resulting in the formation of the L1 0 phase [ 36 ]. However, the situation is completely different when a small amount of Ti is added to FeNi, and no L1 0 structure is generated inside the sample even after HPT treatment [ 37 ].…”

Section: Application Of Hpt To Binary Magnetic Alloysmentioning

confidence: 99%

A Review of Ultrafine-Grained Magnetic Materials Prepared by Using High-Pressure Torsion Method

et al. 2022

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High-pressure torsion (HPT) is a severe plastic deformation technique where a sample is subjected to torsional shear straining under a high hydrostatic pressure. The HPT method is usually employed to create ultrafine-grained nano-structures, making it widely used in processing many kinds of materials such as metals, glasses, biological materials, and organic compounds. Most of the published HPT results have been focused on the microstructural development of non-magnetic materials and their influence on the mechanical properties. The HPT processing of magnetic materials and its influence on the structural and magnetic properties have attracted increasing research interest recently. This review describes the application of HPT to magnetic materials and our recent experimental results on Mn3O4, Mn4N, and MnAl-based alloys. After HPT, most magnetic materials exhibit significantly reduced grain size and substantially enhanced coercivity.

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“…The formation of L1 0 FeNi necessitates a very high rate of interdiffusion of Fe and Ni in the FeNi lattice below 593 K (temperature for the order to disorder transformation). In order to induce high rate of diffusion at low temperatures and to achieve the formation of L1 0 FeNi, several processing techniques such as high energy neutron , or electron or ion beam irradiation, severe plastic deformation, − mechanical alloying, , and approaches such as crystallization from amorphous FeNiSiPBCu, , field-assisted heat treatment of FeNi , and chemically induced ordering such as nitrogen insertion and topotactic extraction, pre-ordered precursor reduction, and so forth are studied.…”

Section: Introductionmentioning

confidence: 99%

Formation of L1₀ Ordering in FeNi by Mechanical Alloying and Field-Assisted Heat Treatment: Synchrotron XRD Studies

et al. 2023

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L10-ordered FeNi, tetrataenite, found naturally in meteorites is a predilection for next-generation rare-earth free permanent magnetic materials. However, the synthesis of this phase remains unattainable in an industrially relevant time frame due to the sluggish diffusion of Fe and Ni near the order–disorder temperature (593 K) of L10 FeNi. The present work describes the synthesis of ordered L10 FeNi from elemental Fe and Ni powders by mechanical alloying up to 12 h and subsequent heat treatment at 623 K for 1000 h without a magnetic field and for 4 h in the presence of 1.5 T magnetic field. Also, to address the ambiguity of L10 phase identification caused by the low difference in the X-ray scattering factor of Fe and Ni, synchrotron-based X-ray diffraction is employed, which reveals that 6 h milling is sufficient to induce L10 FeNi formation. Further milling for 12 h is done to achieve a chemically homogeneous powder. The phase fraction of L10-ordered FeNi is quantified to ∼9 wt % for 12 h milled FeNi, which increases to ∼15 wt % after heat treatment. Heat treatment of the milled powder in a magnetic field increases the long-range order parameter (S) from 0.18 to 0.30. Further, the study of magnetic properties reveals a decrease in magnetic saturation and a slight increase in coercivity with the increase in milling duration. At the same time, heat treatment in the magnetic field shows a considerable increase in coercivity.

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Magnetic Properties of Ternary Fe–Ni–Ti Alloys After Severe Plastic Deformation

Cited by 8 publications

References 19 publications

Magnetic Materials via High-Pressure Torsion of Powders

Magnetic Materials via High-Pressure Torsion of Powders

A Review of Ultrafine-Grained Magnetic Materials Prepared by Using High-Pressure Torsion Method

Formation of L1₀ Ordering in FeNi by Mechanical Alloying and Field-Assisted Heat Treatment: Synchrotron XRD Studies

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Magnetic Properties of Ternary Fe–Ni–Ti Alloys After Severe Plastic Deformation

Cited by 8 publications

References 19 publications

Magnetic Materials via High-Pressure Torsion of Powders

Magnetic Materials via High-Pressure Torsion of Powders

A Review of Ultrafine-Grained Magnetic Materials Prepared by Using High-Pressure Torsion Method

Formation of L10 Ordering in FeNi by Mechanical Alloying and Field-Assisted Heat Treatment: Synchrotron XRD Studies

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Formation of L1₀ Ordering in FeNi by Mechanical Alloying and Field-Assisted Heat Treatment: Synchrotron XRD Studies