New Fe−Co−Ni−Cu−Al−Ti Alloy for Single-Crystal Permanent Magnets

Belyaev, I. V.; Баженов, В. Е.; Moiseev, A. V.; Kireev, A. V.

doi:10.1134/s0031918x16010038

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Сплавы системы Fe - Co широко используют в сов-ременной технике, в частности в магнитотвердых мате-риалах [1,2]. Одной из вредных примесей в этих спла-вах является кислород, который находится в металле как в растворенном виде, так и в виде неметаллических включений.…”

Section: Doi: 1017073/0368-0797-2017-3-230-240unclassified

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Александров¹,

Дашевский²,

Leont’ev³

2017

Izv. vysš. učebn. zaved., Čern. metall.

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Section: Doi: 1017073/0368-0797-2017-3-230-240unclassified

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Александров¹,

Дашевский²,

Leont’ev³

2017

Izv. vysš. učebn. zaved., Čern. metall.

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“…Moreover, MnCr 2 O 4 was also formed in (CoCrFeMnNi) 88 Mo 12 and CoCrFeNiMo x alloys [12,20], which demonstrates that Mo addition has little effect on the inclusion type in HEAs. In terms of the effect of Hf, one of the most reactive elements, HfO 2 oxide, can be easily formed in different alloys [21][22][23], and the impurities and inclusions were determined as a function of the melting method [24]. (Ti,Hf)S hafnium and titanium sulfides and (Ti,Hf) 2 SC titanium and hafnium carbosulfides were found in Fe-Co-Ni-Cu-Al-Ti-Hf alloys with high sulfur contents (0.12wt%-0.32wt%) [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys

Wang,

Park

et al. 2024

Int J Miner Metall Mater

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Specific grades of high-entropy alloys (HEAs) can provide opportunities for optimizing properties toward high-temperature applications. In this work, the Co-based HEA with a chemical composition of Co47.5Cr30Fe7.5Mn7.5Ni7.5 (at%) was chosen. The refractory metallic elements hafnium (Hf) and molybdenum (Mo) were added in small amounts (1.5at%) because of their well-known positive effects on high-temperature properties. Inclusion characteristics were comprehensively explored by using a two-dimensional cross-sectional method and extracted by using a three-dimensional electrolytic extraction method. The results revealed that the addition of Hf can reduce Al2O3 inclusions and lead to the formation of more stable Hf-rich inclusions as the main phase. Mo addition cannot influence the inclusion type but could influence the inclusion characteristics by affecting the physical parameters of the HEA melt. The calculated coagulation coefficient and collision rate of Al2O3 inclusions were higher than those of HfO2 inclusions, but the inclusion amount played a larger role in the agglomeration behavior of HfO2 and Al2O3 inclusions. The impurity level and active elements in HEAs were the crucial factors affecting inclusion formation.

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“…A cosputtered Ni–Ti–Co thin film library is investigated for SME through the evaluation of the phase transformation. First reported in 1975, the Ni–Ti–Co alloy has since found wide applications: as a component of permanent magnets, − high-entropy alloys, , shape memory alloys, and superalloys , along with substantive use in biomedical applications. − The addition of Co to NiTi has been shown to reduce the M s and A s temperatures in combination with the Ni content; it has also been shown to increase yield strength. , These improvements are sought out in elastocaloric cooling technology where ambient transition temperatures and small thermal hysteresis are desired . Until now, investigations on the structural phases, mechanical properties, elastic properties, and phase transformation behavior that have been reported for Ni–Ti–Co involved one-by-one bulk preparation that covered a limited composition space, with addition of Co investigated only up to 10 at.…”

Section: Introductionmentioning

confidence: 99%

Combinatorial Exploration and Mapping of Phase Transformation in a Ni–Ti–Co Thin Film Library

et al. 2020

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Combinatorial synthesis and high-throughput characterization of a Ni− Ti−Co thin film materials library are reported for exploration of reversible martensitic transformation. The library was prepared by magnetron co-sputtering, annealed in vacuum at 500 °C without atmospheric exposure, and evaluated for shape memory behavior as an indicator of transformation. Composition, structure, and transformation behavior of the 177 pads in the library were characterized using high-throughput wavelength dispersive spectroscopy (WDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and four-point probe temperature-dependent resistance (R(T)) measurements. A new, expanded composition space having phase transformation with low thermal hysteresis and Co > 10 at. % is found. Unsupervised machine learning methods of hierarchical clustering were employed to streamline data processing of the large XRD and XPS data sets. Through cluster analysis of XRD data, we identified and mapped the constituent structural phases. Composition−structure− property maps for the ternary system are made to correlate the functional properties to the local microstructure and composition of the Ni−Ti−Co thin film library.

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New Fe−Co−Ni−Cu−Al−Ti Alloy for Single-Crystal Permanent Magnets

Cited by 6 publications

References 11 publications

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

OXYGEN SOLUBILITY IN TITANIUM-CONTAINING Fe-Co MELTS

Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys

Combinatorial Exploration and Mapping of Phase Transformation in a Ni–Ti–Co Thin Film Library

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