Sampling the Cu–Fe–Co phase diagram by severe plastic deformation for enhanced soft magnetic properties

Stückler, Martin; Weissitsch, Lukas; Wurster, Stefan; Krenn, H.; Pippan, Reinhard; Bachmaier, Andrea

doi:10.1016/j.jmrt.2021.03.073

Cited by 10 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To push the limits towards enhanced soft magnetic properties, different Fe-Co ratios are mixed with Cu in Ref. [117] as the addition of Fe can lead to decreasing magnetocrystalline anisotropy and increasing saturation magnetization. Based on findings from binary compositions deformed by HPT-deformation, a region in the ternary phase diagram to synthesize homogeneous nanocrystalline supersaturated solid solutions has been identified (Figure 7).…”

Section: Hpt-deformation Of Powders To Obtain Soft Magnetic Materialsmentioning

confidence: 99%

“…Reprinted from reference. [117] Considering application, a further important magnetic property is magnetoresistivity. A giant decrease of resistivity with increasing applied magnetic field, the giant magneto-resistance (GMR) effect, was first observed for very thin layers of alternating ferromagnetic Fe and antiferromagnetic Cr.…”

Section: Hpt-deformation Of Powders To Obtain Soft Magnetic Materialsmentioning

confidence: 99%

“…Images on the right d)-f) show SEM micrographs of samples processed by the two-step HPT-deformation process at different temperatures. The scale bar in a) applies to all micrographs.Reprinted from reference [117].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Materials via High-Pressure Torsion of Powders

et al. 2023

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Hpt-deformation Of Powders To Obtain Soft Magnetic Materialsmentioning

confidence: 99%

Section: Hpt-deformation Of Powders To Obtain Soft Magnetic Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Materials via High-Pressure Torsion of Powders

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…At a large Co/Fe ratio, Cu–Fe–Co formed nanocomposites after HPT. The soft magnetic properties of the alloy were verified, and the microstructure of the alloy remained stable at 400 °C [ 68 ]. The HPT treatment to Fe 50 Pd 46 Ni 4 and Fe 50 Pd 42 Ni 8 alloys resulted in an increase in Hc up to 1.52–2 times higher than the coercivity of the samples without HPT treatment and more than 5 times higher than the coercivity of the cast alloys [ 69 ].…”

Section: Application Of Hpt To Ternary Magnetic Alloys and Intermetal...mentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

“…In the field of soft magnetic materials, HPT-deformed supersaturated Co-Cu solid solutions have provided tunability for magnetic moments and coercivity by varying the Co-to-Cu ratios [ 5 , 6 ]. Soft magnetic properties have been observed for high Co-content materials [ 5 ], and further improvements were achieved by substituting small amounts of Co with Fe [ 7 ]. Some commercial soft magnetic materials consist of an amorphous matrix in which a crystalline ferromagnetic phase is embedded [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of a High-Pressure Torsion Deformed Co-Zr Alloy

et al. 2023

Self Cite

View full text Add to dashboard Cite

Co-Zr amorphous alloys exhibit soft magnetic properties, whereas the Co-rich crystalline magnetic phases in this alloy system displayed a hard magnetic behavior. In this study, an initial two-phase Co-Zr composite with an overall composition of 75 at.% Co and 25 at.% Zr was processed by high-pressure torsion (HPT), and the effects of severe plastic deformation and subsequent thermal treatment on the composite’s structural evolution and its magnetic properties were investigated. HPT processing allowed us to achieve an amorphous microstructure with low coercivity in its as-deformed state. To further tune the alloy’s magnetic properties and study its crystallization behavior, various annealed states were investigated. The microstructural properties were correlated with the magnetic properties, and a decreasing coercivity with increasing annealing temperatures was observed despite the onset of crystallization in the amorphous alloy. At higher annealing temperatures, coercivity increased again. The results appear promising for obtaining tuneable rare-earth free magnetic materials by severe plastic deformation.

show abstract

Sampling the Cu–Fe–Co phase diagram by severe plastic deformation for enhanced soft magnetic properties

Cited by 10 publications

References 42 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

Magnetic Properties of a High-Pressure Torsion Deformed Co-Zr Alloy

Contact Info

Product

Resources

About