Magnetic characteristics of HPT deformed soft-magnetic materials

Scheriau, Stephan; Kriegisch, M.; Kleber, Siegfried; Mehboob, Nasir; Größinger, R.; Pippan, Reinhard

doi:10.1016/j.jmmm.2010.04.032

Cited by 30 publications

(32 citation statements)

References 9 publications

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“…Most of them are available as powders, ribbons, and thin films and are used in a huge variety of industrial applications such as motors, generators, transformers, sensors, or microelectronic devices. Earlier investigations showed the strong influence of nanostructuring via SPD on magnetic hysteresis characteristics of soft magnetic metals, such as Ni [173,174], Co [175], Fe, and Fe-Si [176]. A sharp increase in the coercivity Hc was revealed in pure metals after SPD processing.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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This chapter focuses on multifunctional properties of bulk nanostructured metallic materials and structure-properties relationship therein. The most important structural factors affecting mechanical, physical, and chemical properties of the nanomaterials are discussed, and the strategies to their further improvement are outlined. Special attention is paid to nanostructural design for simultaneous improvement of mutually exclusive properties. Superstrength and Enhanced Mechanical PropertiesAlthough the mechanical and functional properties of all polycrystalline metallic materials are determined by several factors, the grain size of the material generally plays the most significant and often a dominant role. Thus, the strength of different polycrystalline materials is related to the grain size, d, through the Hall-Petch equation which states that the yield stress, σ y , is given bywhere σ o is termed the friction stress and k y the Hall-Petch constant [1,2]. It follows from Eq. 3.1 that the strength increases with a reduction in the grain size and this has led to an ever-increasing interest in fabricating materials with extremely small grain sizes. The fabrication of bulk samples and billets using equal channel angular pressing (ECAP), high pressure torsion (HPT), and other severe plastic deformation (SPD) techniques was a crucial first step in initiating investigations into the properties of bulk nanomaterials because the use of SPD processing permitted, and subsequently fully supported, a series of systematic studies using various nanostructured metallic materials including commercial alloys [3][4][5][6][7][8]

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Section: Magnetic Propertiesmentioning

confidence: 99%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

View full text Add to dashboard Cite

show abstract

“…However, the results by Scheriau and his co-workers 3) showed that the HPT deformation of FeCo, FeNi solid solution alloys at room temperature did not reach the ferromagnetic exchange length l c .…”

Section: Introductionmentioning

confidence: 95%

“…9. The data obtained by Herzer 1) and by by Scheriau and his co-workers 3) are plotted together. It seems that the coercivity of both pure iron and FeCo increases with the decreasing grain size in accord with the D ¹1 law.…”

Section: Vsm and Squidmentioning

confidence: 99%

“…A question that arises here is whether it is possible to produce soft magnetic materials by cold working such as HPT. Few investigators have studied the influence of the grain refinement by HPT on magnetic properties, except for the work by Scheriau et al 3) Although, the grain refinements for various metallic materials by HPT have been extensively reported by numerous authors, 46) it has been reported that there is an ultimate minimum grain size that can be achieved for pure metals by HPT. Edalati and Horita 5) stated that HPT deformation at room temperature cannot refine the grain size of most of pure metals below 200 nm.…”

Section: Introductionmentioning

confidence: 99%

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Micostructure and Magnetic Properties in Nanostructured Fe and Fe-Based Intermetallics Produced by High-Pressure Torsion

Hosokawa

Ohtsuka

et al. 2014

Mater. Trans.

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The microstructure and magnetic properties of nanostructured pure iron, FeCo and FeNi 3 produced by high-pressure torsion (HPT) were investigated. Electron backscattered diffraction (EBSD) technique was used to study the evolutions in microstructure and crystallographic texture during HPT, revealing that a weak deformation texture with an orientation of h110i bcc being parallel to the disc normal for pure iron and FeCo while h110i fcc was found to be parallel to the hoop direction of the HPT disc in FeNi 3 . The grain size of the HPTed materials was characterized by means of EBSD and transmission electron microscopy (TEM), and its influence on the coercivity was investigated. The other highlight of this paper is the use of a focused ion beam (FIB)-SEM dual beam instrument. This enabled us to obtain quite high image quality (IQ) values for the EBSD measurements even for the highly deformed microstructure in the current ferromagnetic intermetallics. Keywords: bulk nanostructured metals, severe plastic deformation, electron backscattered diffraction (EBSD), magnetic materials, coercivity, focused ion beam-scanning electron microscope (FIB-SEM)

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“…Local adiabatic heating can not only cause dynamic recovery during HPT process, but also lead to a selfannealing within a several hours after the HPT processing. 42) Thus, the reduction in dislocation density and relaxation of residual stress can take place in the HPT-processed samples. A slight growth in grain size may also occur because dislocation annihilation and absorption at boundaries take place in the final stage of the HPT process, in which dynamic recovery is prior to dislocation storage.…”

Section: The Effect Of Plastic Strainmentioning

confidence: 99%

Strain Softening Induced by High Pressure Torsion in Copper Alloys

Pang

Kim

et al. 2015

Mater. Trans.

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Three kinds of Cu-Al alloys and a pure Cu sample with different stacking fault energies (SFEs) are deformed using room temperature rolling (RR) and high pressure torsion (HPT), respectively. The microstructure is analysed by means of transaction electron microscopy and Xray diffraction. It is found that HPT is more feasible to obtain nanocrystals and profuse twins. Tailoring the SFE can promote sample strength without sacrificing the ductility of the Cu alloys. The tensile properties of samples processed by HPT and RR are compared. It is discovered that the HPT process leads to the strain softening phenomenon in samples with relatively high SFE. The excellent mechanical properties can be obtained in samples deformed by HPT with a SFE of 6 mJ/m 2 , in which strain softening was restrained and strain hardening played a dominant role in the deformation process. The relationship between tensile properties and microstructures of the deformed metals is also investigated.

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Magnetic characteristics of HPT deformed soft-magnetic materials

Cited by 30 publications

References 9 publications

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Micostructure and Magnetic Properties in Nanostructured Fe and Fe-Based Intermetallics Produced by High-Pressure Torsion

Strain Softening Induced by High Pressure Torsion in Copper Alloys

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