Time and Thermal Stability of Magnetic Properties in Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20} Bulk Amorphous Alloys

Błoch, K.; Nabiałek, M.; Pietrusiewicz, P.; Gondro, J.; Dośpiał, M.; Szota, M.; Gruszka, K.

doi:10.12693/aphyspola.126.108

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…The properties of the metallic alloys mostly depend on their microstructure, formed during the manufacturing process or through subsequent thermal treatment [1,2,3]. During the last 30 years, extensive studies have been carried out on new groups of functional materials, which come under one or other of the main headings: 'bulk amorphous' and 'nanocrystalline' materials [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Soft magnetic and microstructural investigation in Fe-based amorphous alloy

Nabiałek

2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Soft magnetic and microstructural investigation in Fe-based amorphous alloy

Nabiałek

2015

Journal of Alloys and Compounds

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“…This resulted in structural relaxation through changes in the density and the local chemical composition, leading to a decrease in the number of centres of relaxation. It is shown in the literature 14,[28][29][30][31] that relaxations occur at the atomic level, where the pre-exponential factor in the Arrhenius law is in the order of 10 -15 .…”

Section: Discussionmentioning

confidence: 99%

The influence of an isothermal annealing process on the structure and magnetic properties of the bulk amorphous alloy FeCoBYMo

Pietrusiewicz¹,

Nabiałek²,

Olszewski³

et al. 2017

Mater. Tehnol.

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This paper presents the results of research into a bulk amorphous alloy based on Fe. Samples with the composition Fe61Co10Y8Mo1B20 were prepared in the form of plates using an injection-casting method. The samples were then subjected to an isothermal annealing process (at less than the crystallization temperature) of 700 K for 1 h and 770 K for 3.5 h The structures of the samples were investigated, both in the state after solidification and following the heat treatment, using X-ray diffraction (XRD) and Mössbauer spectroscopy. The results confirmed that the samples, both after solidification and after annealing, were amorphous. Magnetic measurements were carried out using a vibrating-sample magnetometer (VSM) with magnetic fields of up to 2 T. Based on these measurements, the effect of the isothermal annealing process on the magnetic properties was defined, including the saturation magnetization μ0Ms and coercive field Hc. Using the Kronmüller theory, the initial magnetization curves were analysed in the area of approach to ferromagnetic saturation. On the basis of this theory, the quantity and quality of the structural defects were defined; these defects play a critical role in the magnetization process in high magnetic fields. Following this study, the sample annealed at 770 K for 1 h was found to feature a relatively low coercive field and the higher value of magnetization saturation. Linear defects, the so-called quasidislocational dipoles, played the leading role in the process of magnetization of the test samples. Keywords: bulk amorphous alloys, structure, soft magnetic properties, defectŝ lanek predstavlja rezultate raziskave masivne amorfne zlitine na osnovi Fe. Vzorci s sestavo Fe61Co10Y8Mo1B20 so bili pripravljeni v obliki plo{~, s pomo~jo tla~nega litja. Vzorci so bili izotermno`arjeni 1 h (pri temperaturi ni`ji od temperature kristalizacije) na 700 K in 3,5 h na 770 K. Preiskana je bila struktura vzorcev, v stanju po strjevanju in po toplotni obdelavi. Uporabljena je bila rentgenska difrakcija (XRD) in Mössbauerjeva spektroskopija. Rezultati so potrdili, da so bili vzorci po strjevanju in po`arjenju v amorfnem stanju. Magnetne meritve so bile izvedene s pomo~jo magnetometra z vibriranjem vzorca (VSM) v magnetnih poljih jakosti do 2 T. Na osnovi meritev je bil dolo~en vpliv izotermnega`arjenja na magnetne lastnosti, vklju~no z nasi~eno magnetizacijo μ0Ms in koercitivnim poljem Hc. Z uporabo Kronmüllerjeve teorije so bile analizirane za~etne krivulje magnetizacije blizu podro~ja feromagnetnega nasi~enja. Na osnovi te teorije je bila dolo~ena koli~ina in kakovost strukturnih napak; te napake igrajo klju~no vlogo pri procesu magnetizacije v mo~nih magnetnih poljih. Na podlagi te {tudije je bilo ugotovljeno, da vzorci`arjeni 1 h ka`ejo relativno {ibko koercitivno polje in visoko vrednost nasi~ene magnetizacije. Linearne napake, imenovane kvazi-dislokacijski dipoli, igrajo vodilno vlogo pri procesu magnetizacije preizku{anih vzorcev. Klju~ne besede: masivne amorfne zlitine, struktura, mehko magnetne lastn...

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“…[1][2][3] For this reason, they have been widely used in the electrical industry, primarily as high-efficiency cores for power transformers and chokes and also as coatings due to their high corrosion resistance. 4,5 In terms of topological structure, amorphous materials have properties similar to those of liquids.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the structural-defect influence on the magnetization process in and above the Rayleigh region

Gruszka¹

2016

Mater. Tehnol.

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The paper presents studies of the structural-defect influence on the magnetization process in low magnetic fields (H < 0.4 Hc) and above the Rayleigh range. The investigated Fe62Co10Y8B20 alloy samples were obtained with the injection casting method resulting in the amorphous-structure state, which was confirmed with XRD. The studies were conducted by analyzing the disaccommodation of the magnetic-susceptibility process and using Kronmüller's theory in the approach to the ferromagnetic saturation area. On the basis of the obtained results, it was found that the main factor responsible for the processes of magnetization in low magnetic fields are point defects, whereas in the case of high magnetic fields, the magnetization process depends mainly on second-type pseudo-dislocation dipoles. Keywords: metallic glasses, defects, disaccommodation, Kronmüller's theorŷ lanek predstavlja {tudij vpliva strukturnih defektov na proces magnetizacije v {ibkem magnetnem polju (H < 0,4 Hc) in nad Rayleigh podro~jem. Vzorci preiskovane zlitine Fe62Co10Y8B20 so bili izdelani z metodo injekcijskega brizganja, kar je povzro~ilo amorfno strukturo, ki je bila potrjena z rentgensko analizo (XRD). [tudije so bile izvedene z analizo procesa neustreznosti magnetne ob~utljivosti in z uporabo Kronmülerjeve teorije pri pribli`evanju feromagnetno nasi~enemu podro~ju. Na osnovi dobljenih rezultatov je bilo ugotovljeno, da so pri procesu magnetizacije glavni faktor to~kaste napake, medtem ko je v primeru magnetizacije v mo~nem magnetnem polju proces odvisen predvsem od druge vrste psevdodislociranih dipolov.

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Time and Thermal Stability of Magnetic Properties in Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20} Bulk Amorphous Alloys

Cited by 12 publications

References 8 publications

Soft magnetic and microstructural investigation in Fe-based amorphous alloy

Soft magnetic and microstructural investigation in Fe-based amorphous alloy

The influence of an isothermal annealing process on the structure and magnetic properties of the bulk amorphous alloy FeCoBYMo

Analysis of the structural-defect influence on the magnetization process in and above the Rayleigh region

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