第１章 研究の現状と今後の計画（概要）
33． 金属ガラス NEDO 特別講座
開 催 年 月 日 公 開 講 座 名 講 演 タ イ ト ル 講 師 氏 名 場所 参加者数
「アモルファス合金から金属ガ ラスへ」
木村久道 (東北大学) 2008.11.26
「ものづくり基礎講座」
～金属系新素材に関する第 11回技術セミナー～
第2回NEDO公開講座
「金属ガラス溶射とその応用技 術」
五十嵐貴教 (トピー工業株
式会社)
約20名
「金属ガラスの実用化・事業化 への展開」
西山信行 (次世代金属・
複合材料研究 開発協会) 2009.01.30
「ものづくり基礎講座」～
金属系新素材に関する第1 2回技術セミナー～
第3回NEDO公開講座 「非平衡金属軟磁性材料の展開 -アモルファス金属の現状と金属
ガラスへの期待-」
峯村哲郎 (日立金属株式
会社)
約30名
「金属ガラスの基礎と水素エネ ルギー社会への適用可能性」
山浦真一 (東北大学) 2009.03.02
「ものづくり基礎講座」～
金属系新素材に関する第1 3回技術セミナー～
第4回NEDO公開講座
「軟磁性金属ガラスと電子デバ イスへの応用」
小柴寿人 (アルプス電気
株式会社)
クリエイ ション・
コア東大 阪
約40名
2009.03.13
3大学3全国共同利用研究 所連携プロジェクト公開討 論会「先進材料・新接合技 術とその応用」／
東北大学NEDO講座・金属 ガラスイノベーションフォ
ーラム特別講演
「Zr-TM-Alバルク金属ガラスの 機械的性質の問題と改善法」
横山嘉彦 (東北大学)
東北大学 片平キャ
ンパス 約100名
(2) 学内講演会開催
開 催 年 月 日 講 演 タ イ ト ル 講 師 氏 名 場所 参加者数
2008.12.08 “Some recent progress in novel applications of soft magnetic thin films from Bulk Glassy Materials”
K. V. Rao (スウェーデン
ストックホル ム王立工科研
究所)
約40名
2009.03.09 「一セラミックス屋が見た日本人の常識と世界人の常識
－グローバルスタンダードの怪しさ－」
吉村昌弘 (東京工業大学
名誉教授)
東北大学 金属材料 研究所
約40名
(3) 展示会開催
開 催 年 月 日 会 議 名 展 示 者 名 場所
2009.03.13
3大学3全国共同利用研究所連携プロジェ クト公開討論会「先進材料・新接合技術 とその応用」／
東北大学NEDO講座・金属ガラスイノベ ーションフォーラム特別講演
1.名古屋大学 2.東京医科歯科大学 3.早稲田大学
4.金属ガラスNEDO講座 5.RIMCOF東北大研究室 6.科学技術振興機構 7.中小企業基盤整備機構 8.シーエムシー出版 9.株式会社テクノシステム
東北大学片平キャンパス
(4) 研究発表・講演（口頭発表も含む）
開 催 年 月 日 会 議 名 講 演 タ イ ト ル 講 師 氏 名 場所 参加者数
2008.10.09
早稲田大学ナノ理工学研究 機構・金属ガラスイノベー ションフォーラム合同シン
ポジウム
「軟磁性金属ガラスと電子デバイ スへの応用」
牧野彰宏 (東北大学)
早稲田大
学 約150名
2008.10.20
「ものづくり基礎講座」
～金属系新素材に関する第 9回技術セミナー～
第1回NEDO公開講座
「鉄基非平衡相軟磁性材料の研究 開発動向」
牧野彰宏 (東北大学)
クリエイ ション・
コア東大 阪
約40名
2008.10.31 粉体粉末冶金協会講演会 「超高Bs Fe合金ナノ結晶磁性材
料の開発」
牧野彰宏 (東北大学)
東北大学 金属材料 研究所
約30名
2009.03.02
「ものづくり基礎講座」～
金属系新素材に関する第1 3回技術セミナー～
第4回NEDO公開講座
「金属ガラスの基礎と水素エネル ギー社会への適用可能性」
山浦真一 (東北大学)
クリエイ ション・
コア東大 阪
約40名
Ref. 1
Synthesis of ferromagnetic Fe-based bulk glassy alloys in the Fe–Si–B–P–C system Journal of Alloys and Compounds, 473 (2009), 368-372
Chuntao Chang, Takeshi Kubota, Akihiro Makino and Akihisa Inoue
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan Abstract
Multi-component Fe76P5(BxSiyCz)19 glassy alloyswere fount to exhibit a distinct glass transition, followed by a supercooled liquid region before crystallization in a rather wide composition range.
The largest value of the supercooled liquid region defined by the difference between the glass transition temperature (Tg) and crystallization temperature (Tx), Tx (=Tx −Tg) was 54K for Fe76P5(Si0.3B0.5C0.2)19. Furthermore, the crystallization of the glassy alloy occurs through a single exothermic reaction, which means simultaneous precipitation of several kinds of crystallites leading to higher glassy forming ability (GFA) due to the necessity of the atomic rearrangement on a long range scale. By copper mold casting, bulk glassy alloy rods with diameters up to 3mm were produced. The representative Fe76P5(Si0.3B0.5C0.2)19 alloy exhibits rather high saturation magnetization of 1.44 T with good soft-magnetic properties, i.e., low coercive force of 1.2 A/m, and high effective permeability of 17,600 at 1 kHz under a field of 1 A/m. The bulk glassy alloy also possesses superhigh fracture strength of 3700MPa and Young’s modulus of 185GPa. This new ferromagnetic bulk glassy alloy simultaneously exhibiting high GFA, rather high saturation magnetization, excellent soft-magnetic properties and superhigh fracture strength is promising for future applications as not only functional but also structural material.
Ref. 2
The effect of Cu on the plasticity of Fe–Si–B–P-based bulk metallic glass Scripta Materialia, 60 (2009), 277-280
Akihiro Makino, Xue Li, Kunio Yubuta, Chuntao Chang, Takeshi Kubota and Akihisa Inoue Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
Abstract
A (Fe0.76Si0.096B0.084P0.06)99.9Cu0.1 bulk metallic glass exhibits strength of 3.3 GPa and a large plastic deformation of about 3.1% in compression. A well-developed vein pattern on the fracture surface and easily distinguishable highly dense multiple shear bands on the side surface of the rod specimen near the fracture surface were observed. The unusual deformation behavior could be due to the existence of a large number of α-Fe nanocrystals (less than 10 nm) embedded in a glassy matrix.
Ref. 3
急冷凝固 Ni-Nb-Ta-Zr-Co アモルファス合金の水素透過性とメタノール水蒸気改質による水素
製造への適用
材料, 57 (2008), 1031-1035
山浦真一1)，木村久道1)，井上明久1)，新保洋一郎2)，西田元紀2)，上宮成之3)
1) 東北大学金属材料研究所 〒980-8577 仙台市青葉区片平
2) 福田金属箔粉工業㈱ 〒607-8305 京都市山科区西野山中臣町
3) 岐阜大学工学部 〒501-1193 岐阜市柳戸 Abstract
The Ni40Nb20Ta5Zr30Co5 amorphous alloy membranes were prepared by a single-roller melt-spinning technique. The crystallization temperature of the alloy is 825 K in an Ar
atmosphere. Hydrogen permeability of the alloy was measured at the temperature of 573-673 K.
As a result, it was found that the initial permeability measured at 673K was higher than 1×10-8 mol·m-1·s-1·Pa-1/2 and that the permeability significantly degraded during the measurement.
However, the lower the measurement temperature was, the smaller the degradation of permeability became. The permeability of the alloy measured at 573 K was kept constant at 5×10-9 mol·m-1·s-1·Pa-1/2 during the measurement. Then the hydrogen production by methanol steam reforming was conducted by using the amorphous alloy membrane. As a result, pure hydrogen was extracted by the amorphous alloy membrane from a reformed gas consisting of H2, N2, CO2 and CO and its separation property did not degrade during the experiment for 6 h. Moreover, it was found that the amount of hydrogen flux depended on the flow rate of Ar sweep gas introduced into the lower-side chamber of the reactor. From this observation, the hydrogen permeability of the membrane during the methanol steam reforming was roughly estimated. The estimated permeability during the reforming is about 3.4×10-9 mol·m-1·s-1·Pa-1/2. The value is smaller than that obtained from the permeation measurement with pure H2, which may come from pressure loss caused by the boundary film layer on the membrane surface and from surface contamination such as CO adsorption. The potential of amorphous alloy membranes for hydrogen production has been successfully demonstrated.
Ref. 4
Development of the Ni-based Metallic Glassy Bipolar Plates for Proton Exchange Membrane Fuel Cell (PEMFC),
Journal of Physics: Conference Series, 144 (2009), 012001
Shin-ichi Yamaura, Masanori Yokoyama, Hisamichi Kimura and Akihisa Inoue
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
Abstract
Alloy optimization in the Ni80-xCrxP16B4 (x=9-30 at%) alloy system was conducted in order to achieve low Tg, Tx and a large ΔTx. From this study, the Ni65Cr15P16B4 glassy alloy was found to be the optimal alloy. The static and potentiodynamic corrosion behaviours of this alloy were measured. As a result of polarization measurements, it was found that the current density of the non-polished glassy alloy sample was smaller than that of a SUS316L sample. By contrast, the current density of the surface-polished glassy sample was slightly larger than that of the SUS316L sample in the voltage range of 0.3-0.8 V. A bipolar plate was successfully produced by hot-pressing the glassy alloy sheet in a supercooled liquid state. The I-V characteristics of a single cell with the glassy bipolar plates were measured.
Ref. 5
Potential applications of amorphous/metallic glassy alloys as hydrogen-permeable membranes for hydrogen production and bipolar plates for PEFC
International Journal of Nuclear Hydrogen Production and Applications, 2 (2009), 69-77
Shin-ichi Yamaura, Masanori Yokoyama, Hisamichi Kimura and Akihisa Inoue
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan
Abstract
The potential of amorphous / metallic glassy alloys as hydrogen permeable membrane for hydrogen production and as bipolar plate for Polymer Electrolyte Fuel Cell (PEFC) was investigated in this paper. Firstly, the hydrogen permeation of the melt-spun (Ni0.6Nb0.4)70Zr30-yTay
(y=5, 10, 15 and 20) alloys was measured. As the result, it was found that the hydrogen permeability of the alloys decreased with decreasing Zr content. However, degradation during permeation test of the alloy with 10at%Ta is smaller than that with 5at%Ta. Therefore, it can be concluded that Ta addition stabilizes the permeation behavior preventing significant degradation during time despite that Ta addition does not affect hydrogen permeability of the alloys. Secondly, the Ni65Cr15P16B4 metallic glassy alloy was produced by melt-spinning in air. The bipolar-plate was successfully produced by hot-pressing with dies in a supercooled liquid state. It was shown that this alloy could be a good candidate for a bipolar plate material for PEFC.
【主要５文献】
Ref. 1 Chuntao Chang, Takeshi Kubota, Akihiro Makino and Akihisa Inoue
Synthesis of ferromagnetic Fe-based bulk glassy alloys in the Fe–Si–B–P–C system Journal of Alloys and Compounds, 473 (2009), 368-372.
Ref. 2 Akihiro Makino, Xue Li, Kunio Yubuta, Chuntao Chang, Takeshi Kubota and Akihisa Inoue
The effect of Cu on the plasticity of Fe–Si–B–P-based bulk metallic glass, Scripta Materialia, 60 (2009), 277-280.
Ref. 3 山浦真一，木村久道，井上明久，新保洋一郎，西田元紀，上宮成之
急冷凝固 Ni-Nb-Ta-Zr-Co アモルファス合金の水素透過性とメタノール水蒸気改質による
水素製造への適用,
材料, 57 (2008), 1031-1035.
Ref. 4 Shin-ichi Yamaura, Masanori Yokoyama, Hisamichi Kimura and Akihisa Inoue
Development of Ni-based Metallic Glassy Bipolar Plates for Proton Exchange Membrane Fuel Cell (PEMFC),
Journal of Physics: Conference Series, 144 (2009), 012001.
Ref. 5 Shin-ichi Yamaura, Masanori Yokoyama, Hisamichi Kimura and Akihisa Inoue
Potential applications of amorphous/metallic glassy alloys as hydrogen permeable membrane for hydrogen production and bipolar plate for PEFC,
International Journal of Nuclear Hydrogen Production and Applications, 2 (2009), 69-77.
【研究計画】
今後も本講座の趣旨に沿って金属ガラスに関する講演活動、人材交流事業を進め、金属ガラス研究開 発成果の普及を推進する。また、専任教員による金属ガラスに関する研究を実施のみならず、2009年
8 月 20-21 日には東北大学大学院講義・リカレント公開講座を開催し、随時行われる大学院生向け学
内講演会と合わせて、金属ガラス工学分野発展推進を目的とした人材育成を行う。