Soft magnetic properties of high-temperature nanocrystalline alloys: Permeability and magnetoimpedance

Blázquez, J.S.; Franco, V.; Conde, A.; Kiss, L. F.

doi:10.1063/1.1539294

Cited by 23 publications

(16 citation statements)

References 36 publications

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“…Although a high saturation magnetization was achieved in HITPERM alloys [6], as well as a wide temperature range of constant permeability [8], the coercivity at room temperature increases one or two orders of magnitude with respect to the Co-free alloys (from 1-10 A/m up to ~100 A/m [6,9]). Focusing on this problem, Suzuki et al recently proposed a small substitution of Ge for Fe as a more effective way to improve soft magnetic properties at high temperatures than the partial substitution of Co for Fe [10].…”

Section: Introductionmentioning

confidence: 98%

“…The maximum Co concentration studied in the alloys is 20 at. %, in order to search for a new showed that this parameter is seriously deteriorated for higher Co contents [6][7][8][9]. Although Ge is soluble in -Fe, the benefits of its addition to NANOPERM alloys would be due to its partition to the residual amorphous matrix [10], not producing a deleterious effect on the crystalline phase.…”

Section: Introductionmentioning

confidence: 99%

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Partial substitution of Co and Ge for Fe and B in Fe–Zr–B–Cu alloys: microstructure and soft magnetic applicability at high temperature

et al. 2005

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The partial substitutions of Co for Fe and Ge for B are studied for a Fe 83-x Co x Zr 6 B 10-y Ge y Cu 1 alloy series (x = 0, 5 and 20; y = 0 and 5) as a possible way to enhance the high temperature applicability of NANOPERM alloys. The devitrification process, the nanocrystallization kinetics and the nanocrystalline microstructure are similar for all the studied alloys. Good soft magnetic properties are observed even at a high crystalline volume fraction of bcc -Fe nanocrystals, which are stable up to ~1000 K. The partial substitution of Co for Fe is very effective to increase the Curie temperature of the residual amorphous matrix (T C AM ). Although the substitution of Ge for B is ineffective to increase T C AM , a clear increase of the saturation magnetization with respect to the Ge-free alloy can be observed. These nanocrystalline compositions have a high concentration of Fe and a typical composition: Fe-M-ET-(Cu), where M is a metalloid and ET is an early transition metal. The addition of metalloids, such as B, P, Si, etc., is necessary to enable the production of a precursor amorphous alloy by rapid quenching techniques, from which the nanocrystalline microstructure is obtained after controlled crystallization. It is important to distinguish two different kinds of metalloids: those highly soluble in the -Fe phase (e.g. Si) and those whose solubility in this phase is very restricted (e.g. B). The former elements will be generally dissolved in the crystalline phase, increasing the crystalline volume fraction but deteriorating some magnetic properties like the saturation magnetization and the Curie temperature of the crystalline phase. The latter elements will remain in the amorphous matrix and will diminish the maximum volume fraction of nanocrystals, although preserving the purity of the -Fe phase.The early transition metals (Zr, Nb, Hf, etc.) have a very low solubility in the -Fe phase and, consequently, will remain in the amorphous matrix. However, due to the very slow diffusivity of these elements in the amorphous phase, they pile up at the crystal-matrix interface and constrain the growth of the crystalline phase to the nanocrystalline scale. was proposed mainly because of the strong increase of the Curie temperature of the residual amorphous phase (T C AM ) due to the partial substitution of Co for Fe with respect to the Cofree NANOPERM alloy [7]. In fact, the exchange coupling between nanocrystals is transmitted through the ferromagnetic residual amorphous matrix and thus, at temperatures above the Curie temperature of this residual amorphous matrix, the nanocrystals become exchange uncoupled and, consequently, the outstanding soft magnetic properties of these In this work, the combined effect of partial substitution of Co for Fe and Ge for B on the microstructure and the magnetic properties of nanocrystalline alloys is studied. The maximum Co concentration studied in the alloys is 20 at. %, in order to search for a new showed that this parameter is seriously deteriorated for higher Co con...

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Partial substitution of Co and Ge for Fe and B in Fe–Zr–B–Cu alloys: microstructure and soft magnetic applicability at high temperature

et al. 2005

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“…Therefore, although TCP values of this paper are not better than the previously reported, the larger values of make these alloys interesting for applications. In the case of 5 at.% Co alloy, at room temperature and 6 kHz, ϳ 4000 is four times larger than that of Fe 39 Co 39 Nb 6 B 15 Cu 1 alloy 7 …”

Section: E721-2mentioning

confidence: 84%

“…18͔͒, with ⌬T extended up to 900 K. The maximum permeability reported among these alloys was ϳ 1000. 7 For the two systems subject of the present paper, the optimum values of TCP are 0.10%/K and 0.04%/K for Co5 and Co20 alloys, respectively, in a temperature range from room temperature up to 915 K. For applications, a compromise between TCP and values should be found. Therefore, although TCP values of this paper are not better than the previously reported, the larger values of make these alloys interesting for applications.…”

Section: E721-2mentioning

confidence: 99%

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Magnetic permeability of (FeCoGe)88Zr6B5Cu1 alloys: Thermal stability in a wide temperature range

Blázquez

Conde

Franco

et al. 2008

Journal of Applied Physics

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A Novel Soft‐Magnetic B2‐Based Multiprincipal‐Element Alloy with a Uniform Distribution of Coherent Body‐Centered‐Cubic Nanoprecipitates

Wang

Zhou

et al. 2021

Advanced Materials

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Multiprincipal‐element alloys (MPEAs), including high‐entropy alloys, are a new class of materials whose thermodynamical properties are mainly driven by configuration entropy, rather than enthalpy in the traditional alloys, especially at high temperatures. Herein, the design of a novel soft‐magnetic nonequiatomic, quaternary MPEA is described, via tuning its chemical composition to deliberately manipulate its microstructure, such that it contains ultrafine ferromagnetic body‐centered‐cubic (BCC) coherent nanoprecipitates (3–7 nm) uniformly distributed in a B2‐phase matrix. The new alloy Al1.5Co4Fe2Cr exhibits high saturation magnetization (MS = 135.3 emu g‐1), low coercivity (HC = 127.3 A m‐1), high Curie temperature (TC = 1061 K), and high electrical resistivity (ρ = 244 μΩ cm), promising for soft magnets. More importantly, these prominent soft‐magnetic properties are observed to be retained even after the alloy is thermally exposed at 873 K for 555 h, apparently attributable to the excellent stability of the coherent microstructure. The versatility of the magnetic properties of this new alloy is discussed in light of the microstructural change induced by tuning the chemical composition, and the enhanced performance of the alloy is compared directly with that of the traditional soft‐magnetic alloys. The perspective is also addressed to design high‐performance soft‐magnetic alloys for high‐temperature applications.

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Soft magnetic properties of high-temperature nanocrystalline alloys: Permeability and magnetoimpedance

Cited by 23 publications

References 36 publications

Partial substitution of Co and Ge for Fe and B in Fe–Zr–B–Cu alloys: microstructure and soft magnetic applicability at high temperature

Partial substitution of Co and Ge for Fe and B in Fe–Zr–B–Cu alloys: microstructure and soft magnetic applicability at high temperature

Magnetic permeability of (FeCoGe)88Zr6B5Cu1 alloys: Thermal stability in a wide temperature range

A Novel Soft‐Magnetic B2‐Based Multiprincipal‐Element Alloy with a Uniform Distribution of Coherent Body‐Centered‐Cubic Nanoprecipitates

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