EXAFS-spectroscopy and thermal neutron diffraction study of the effect of deformation by high pressure torsion on the atomic ordering and magnetic properties of the FeCo alloy

Glezer, A. M.; Muradimova, L. F.; Borisova, P. A.; Велигжанин, А. А.; Chernysheva, Olga; Сундеев, Р.В.; Louzguine-Luzgin, Dmitri V.; Перов, Н. С.; Shirshikov, S. O.; Tomchuk, A. A.

doi:10.1016/j.jallcom.2021.159021

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…Coercivity increased with microstructure refinement until a grain size of $ 100 nm, below which it decreased rapidly, as predicted by Herzer. 70 Glezer et al published a series of papers that explored HPT processing of various soft-magnetic alloys, [71][72][73][74][75][76] (6) Fe-24 at.%Al, (7) (FeCo) 100-x ÀV x alloys (X = 0, 1.5, 3, 4.5, and 6), and (8) Fe-50Co.…”

Section: High-pressure Torsionmentioning

confidence: 99%

“…Recently, Glezer et al examined HPT processing of (Fe-Co) 100-x V x alloys (X = 0, 1.5, 3, 4.5, and 6). 75,76 Deformation was imposed at ambient and cryogenic (77 K) temperatures to develop microstructures with deformed and dynamically recrystallized regions (effective grain size of 50 nm to 250 nm). The extent of the equilibrium ordered B2 structure decreased with increased revolutions.…”

Section: High-pressure Torsionmentioning

confidence: 99%

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Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

Kustas

Susan

Monson

2022

JOM

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Soft-magnetic alloys exhibit exceptional functional properties that are beneficial for a variety of electromagnetic applications. These alloys are conventionally manufactured into sheet or bar forms using well-established insgot metallurgy practices that involve hot- and cold-working steps. However, recent developments in process metallurgy have unlocked opportunities to directly produce bulk soft-magnetic alloys with improved, and often tailorable, structure–property relationships that are unachievable conventionally. The emergence of unconventional manufacturing routes for soft-magnetic alloys is largely motivated by the need to improve the energy efficiency of electromagnetic devices. In this review, literature that details emerging manufacturing approaches for soft-magnetic alloys is overviewed. This review covers (1) severe plastic deformation, (2) recent advances in melt spinning, (3) powder-based methods, and (4) additive manufacturing. These methods are discussed in comparison with conventional rolling and bar processing. Perspectives and recommended future research directions are also discussed.

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Section: High-pressure Torsionmentioning

confidence: 99%

Section: High-pressure Torsionmentioning

confidence: 99%

Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

Kustas

Susan

Monson

2022

JOM

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“…The results of neutron diffraction and EXAFS spectroscopy tests show that HPT causes a significant reduction in the degree of long-range order in FeCo alloys. It is demonstrated that, after HPT, an ultrafine structure with a high degree of B2 ordering was formed in the FeCo alloy covering the nearest coordination spheres of Fe and Co atoms with a very low intensity of superstructure lines in neutron diffraction patterns [ 40 ].…”

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 choice of this size range is not accidental but is determined by a number of size effects and the coincidence of the crystallite sizes with the characteristic sizes for various physical phenomena. The lower limit is related to the lower limit of symmetry of the nanocrystalline material [53][54][55]. The point is that as the size of the crystal, which is characterized by a strict set of symmetry elements, decreases, a moment comes when some symmetry elements will be lost.…”

Section: Terminology and Classification Of Nanoparticlesmentioning

confidence: 99%

“…According to [54,55], for the most widespread crystals with a bcc and fcc lattice, this critical size equals three coordination spheres, which for iron is about 0.5 nm, and for nickel, it is about 0.6 nm. The value of the upper limit is due to the fact that noticeable and interesting from a technical point of view, changes in the physical and mechanical properties of materials (strength, hardness, coercive force, etc.)…”

Section: Terminology and Classification Of Nanoparticlesmentioning

confidence: 99%

Current status and trends in the physicochemical properties of nanomaterials and nanotechnology researches

2022

ijp

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According to the estimates of many authors, in 10-15 years, the world market for nanotechnology products will amount to about 1 trillion $. The share of nanomaterials, in this case, is very large (about 340 billion). Therefore, research on nanomaterials properties becomes one of the most important tasks of the science of nanostructured materials. In this regard, it will be essential to expand research on the influence of size and thermal stability; as two common problems for almost all types of nanomaterials. This review article will discuss the most popular topics on nanomaterials, nanostructures, their history, characteristics and classification as well as status of their scientific articles published in recent years. This study focuses on a range of topics related to the development, research and manufacturing applications of nanomaterials and nanotechnology. There are many problems and challenges that scientists are investigating on them. For example: what are the main differences between the properties of interfaces of nanomaterials (including hybrid ones) from the characteristics of ordinary bulk states? How widely can the self-assembly technique of nanoscale devices elements be developed, considering possible installation errors?

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EXAFS-spectroscopy and thermal neutron diffraction study of the effect of deformation by high pressure torsion on the atomic ordering and magnetic properties of the FeCo alloy

Cited by 8 publications

References 27 publications

Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

Emerging Opportunities in Manufacturing Bulk Soft-Magnetic Alloys for Energy Applications: A Review

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

Current status and trends in the physicochemical properties of nanomaterials and nanotechnology researches

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