Fabrication and soft-magnetic properties of Fe-B-Nb-Y glassy powder compacts by spark plasma sintering technique

Sangmin Lee; Hidemi Kato; Takeshi Kubota; Akihiro Makino; Akihisa Inoue

doi:10.1016/j.intermet.2008.07.021

Fabrication and soft-magnetic properties of Fe-B-Nb-Y glassy powder compacts by spark plasma sintering technique

Sangmin Lee, Hidemi Kato, Takeshi Kubota, Akihiro Makino, Akihisa Inoue

IMR - Materials Development Division

Tohoku University

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

Magnetic properties of (Fe_0.72B_0.24Nb_0.04)_95.5Y_4.5 sample were investigated. The sample was produced from glassy powders made by the gas-atomization and consolidation using the spark plasma sintering (SPS) technique. Maximum relative density of 99.5% was achieved in the spark plasma sintered (SPSed) compact due to the viscous flow enhanced by the applied stress even under the glass transition temperature. X-ray diffraction pattern of the compact indicates that the glassy structure was maintained through the SPS process. However, the results of differential scanning calorimetry (DSC) showed that the glass transition temperature and crystallization temperature of the SPSed glassy compact shift to a higher and lower temperature, respectively, that is, a smaller ΔT_x. Saturation magnetization of the SPSed glassy compact became 10% higher than that of the initial glassy powder. The Curie point was enhanced from 522 K for the glassy powder to 548 K for the SPSed glassy compact. Spin-exchange interaction is expected to be enhanced by a short-range scale atomic rearrangement caused by the high applied stress and temperature during the SPS process.

Original language	English
Pages (from-to)	218-221
Number of pages	4
Journal	Intermetallics
Volume	17
Issue number	4
DOIs	https://doi.org/10.1016/j.intermet.2008.07.021
Publication status	Published - 2009 Apr

Keywords

Magnetic applications
Magnetic intermetallics
Magnetic properties
Metallic glasses
Powder metallurgy

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10.1016/j.intermet.2008.07.021

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title = "Fabrication and soft-magnetic properties of Fe-B-Nb-Y glassy powder compacts by spark plasma sintering technique",

abstract = "Magnetic properties of (Fe0.72B0.24Nb0.04)95.5Y4.5 sample were investigated. The sample was produced from glassy powders made by the gas-atomization and consolidation using the spark plasma sintering (SPS) technique. Maximum relative density of 99.5% was achieved in the spark plasma sintered (SPSed) compact due to the viscous flow enhanced by the applied stress even under the glass transition temperature. X-ray diffraction pattern of the compact indicates that the glassy structure was maintained through the SPS process. However, the results of differential scanning calorimetry (DSC) showed that the glass transition temperature and crystallization temperature of the SPSed glassy compact shift to a higher and lower temperature, respectively, that is, a smaller ΔTx. Saturation magnetization of the SPSed glassy compact became 10% higher than that of the initial glassy powder. The Curie point was enhanced from 522 K for the glassy powder to 548 K for the SPSed glassy compact. Spin-exchange interaction is expected to be enhanced by a short-range scale atomic rearrangement caused by the high applied stress and temperature during the SPS process.",

keywords = "Magnetic applications, Magnetic intermetallics, Magnetic properties, Metallic glasses, Powder metallurgy",

author = "Sangmin Lee and Hidemi Kato and Takeshi Kubota and Akihiro Makino and Akihisa Inoue",

note = "Funding Information: The authors are indebted to Prof. K.V. Rao, Mr. Ansar Masood at KTH for MTG measurement and thank Prof. H. Kimura, Mr. A. Okubo, Mr. Kanomata, Mr. I. Nagano at Institute for Materials Research (IMR), Tohoku University in carrying out the experiments. This work was supported by a Grant-in-Aid for Science Research on Priority Areas, “Materials Science of Bulk Metallic Glasses”, from the Ministry of Education, Science, Sports and Culture of Japan.",

year = "2009",

month = apr,

doi = "10.1016/j.intermet.2008.07.021",

language = "English",

volume = "17",

pages = "218--221",

journal = "Intermetallics",

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T1 - Fabrication and soft-magnetic properties of Fe-B-Nb-Y glassy powder compacts by spark plasma sintering technique

AU - Lee, Sangmin

AU - Kato, Hidemi

AU - Kubota, Takeshi

AU - Makino, Akihiro

AU - Inoue, Akihisa

N1 - Funding Information: The authors are indebted to Prof. K.V. Rao, Mr. Ansar Masood at KTH for MTG measurement and thank Prof. H. Kimura, Mr. A. Okubo, Mr. Kanomata, Mr. I. Nagano at Institute for Materials Research (IMR), Tohoku University in carrying out the experiments. This work was supported by a Grant-in-Aid for Science Research on Priority Areas, “Materials Science of Bulk Metallic Glasses”, from the Ministry of Education, Science, Sports and Culture of Japan.

PY - 2009/4

Y1 - 2009/4

N2 - Magnetic properties of (Fe0.72B0.24Nb0.04)95.5Y4.5 sample were investigated. The sample was produced from glassy powders made by the gas-atomization and consolidation using the spark plasma sintering (SPS) technique. Maximum relative density of 99.5% was achieved in the spark plasma sintered (SPSed) compact due to the viscous flow enhanced by the applied stress even under the glass transition temperature. X-ray diffraction pattern of the compact indicates that the glassy structure was maintained through the SPS process. However, the results of differential scanning calorimetry (DSC) showed that the glass transition temperature and crystallization temperature of the SPSed glassy compact shift to a higher and lower temperature, respectively, that is, a smaller ΔTx. Saturation magnetization of the SPSed glassy compact became 10% higher than that of the initial glassy powder. The Curie point was enhanced from 522 K for the glassy powder to 548 K for the SPSed glassy compact. Spin-exchange interaction is expected to be enhanced by a short-range scale atomic rearrangement caused by the high applied stress and temperature during the SPS process.

AB - Magnetic properties of (Fe0.72B0.24Nb0.04)95.5Y4.5 sample were investigated. The sample was produced from glassy powders made by the gas-atomization and consolidation using the spark plasma sintering (SPS) technique. Maximum relative density of 99.5% was achieved in the spark plasma sintered (SPSed) compact due to the viscous flow enhanced by the applied stress even under the glass transition temperature. X-ray diffraction pattern of the compact indicates that the glassy structure was maintained through the SPS process. However, the results of differential scanning calorimetry (DSC) showed that the glass transition temperature and crystallization temperature of the SPSed glassy compact shift to a higher and lower temperature, respectively, that is, a smaller ΔTx. Saturation magnetization of the SPSed glassy compact became 10% higher than that of the initial glassy powder. The Curie point was enhanced from 522 K for the glassy powder to 548 K for the SPSed glassy compact. Spin-exchange interaction is expected to be enhanced by a short-range scale atomic rearrangement caused by the high applied stress and temperature during the SPS process.

KW - Magnetic applications

KW - Magnetic intermetallics

KW - Magnetic properties

KW - Metallic glasses

KW - Powder metallurgy

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ER -

Fabrication and soft-magnetic properties of Fe-B-Nb-Y glassy powder compacts by spark plasma sintering technique

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