Grain Boundaries and Saturation Magnetization in Submicron Grained Nickel

Mulyukov, Kh. Ya.; Khaphizov, S.B.; Valiev, Ruslan Z.

doi:10.1002/pssa.2211330228

Cited by 35 publications

(9 citation statements)

References 7 publications

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“…The value of Ms in nd-Ni is in agreement with that of bulk Ni, whereas HPT-Ni has a 2.3 % smaller Ms. This is consistent with a previous study which reports that the decrease of Ms is due to a grain-boundary phase with lower crystal symmetry [14].…”

Section: Resultssupporting

confidence: 91%

“…Several researchers have approached this issue using pure Ni processed via HPT straining (HPT-Ni) [13][14][15][16][17]. Nickel is one of the simplest ferromagnets at room temperature with a stable face-centered cubic crystal structure and suitable as a model system to investigate the fundamentals of the effects induced via HPT straining.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the change in the microstructure in Ni often brings about unique magnetic properties, e.g., a lower Curie temperature and a smaller saturation magnetization in amorphous Ni and enhanced magnetic anisotropy in nanocrystalline Ni [18,19]. Scheriau et al and Mulyukov et al reported an increase of the coercivity as well as a decrease of the saturation magnetization in HPT-Ni [13,14,17]. These results were interpreted as possible effects of the crystal defects.…”

Section: Introductionmentioning

confidence: 99%

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Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel

Oba

Bersweiler

Titov

et al. 2021

Phys. Rev. Materials

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Magnetic-field-dependent unpolarized small-angle neutron scattering (SANS) experiments demonstrate that high-pressure torsion (HPT) straining induces spin misalignments in pure Ni, which persist in magnetic fields up to 4 T. The spin-misalignment scattering patterns are elongated perpendicular to the applied magnetic field due to an unusual predominant longitudinal sin 2 -type angular anisotropy. Such a contribution cannot be explained by the conventional second order (in spin misalignment amplitude) micromagnetic SANS theory in the approach-to-saturation regime, nor can its magnitude relative to the other features of the cross sections by the third order micromagnetic SANS theory. This indicates that the high-density of crystal defects induced via HPT straining in Ni makes such higher-order effects in the micromagnetic SANS cross sections observable.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel

Oba

Bersweiler

Titov

et al. 2021

Phys. Rev. Materials

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“…[1][2][3][4][5] Researchers all across the world are actively pursuing the research to understand the entire spectrum of properties of UFG materials. Among others, mechanical behavior is of paramount importance for structural application.…”

Section: Easy Accessibility Of An Ultrafine-grained (Ufg)mentioning

confidence: 99%

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Kumar

Mishra

2012

Metall Mater Trans A

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Friction-stir processing (FSP) of twin-roll cast (TRC) Al-Mg-Sc alloy resulted into ultrafinegrained microstructure. The alloy was processed in as-received and aged (563 K [290°C], 22 hours) conditions and at three different tool rotation rates: 800, 400, and 325 rpm. The microstructural features were characterized using electron backscattered diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The grain size varied from 0.89 lm to 0.39 lm depending on the processing and initial thermo-mechanical conditions of the alloy. The TRC alloy processed at 325 rpm in aged condition had all the grains less than 1 lm, and 95 pct of grains had high-angle grain boundaries (HAGBs). In all the cases, the fraction of HAGBs were more than 80 pct. The variation of misorientation angle distribution was similar to the theoretical MacKenzie distribution for cubic crystal materials. Grain size analysis at different sections and locations on the transverse section of the dynamically recrystallized zone showed a homogeneous and equiaxed microstructure. The average dispersoid (Al 3 (Sc,Zr)) size was~8.0 nm in diameter obtained using high-resolution TEM. Grain size reduction was observed with increase in Zener-Hollomon parameter. It was shown that under the current microstructural and deformation conditions, dynamic recrystallization via particlestimulated nucleation might not be possible during FSP.

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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: 96%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

Self Cite

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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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Grain Boundaries and Saturation Magnetization in Submicron Grained Nickel

Cited by 35 publications

References 7 publications

Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel

Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel

Ultrafine-Grained Al-Mg-Sc Alloy via Friction-Stir Processing

Multifunctional Properties of Bulk Nanostructured Metallic Materials

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