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Microstructural Control of Mg_2Ni Hydrogen Absorbing Alloys by Rapid Solidification and Mechanical Grinding

Research Project

Project/Area Number 09650757
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionNAGAOKA UNIVERSIYT OF TECHNOLOGY

Principal Investigator

KAMADO Shigeharu  Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30152846)

Co-Investigator(Kenkyū-buntansha) KOJIMA Yo  Nagaoka University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (60016368)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsMg_2Ni alloy / Hydrogen Absorbing Alloy / Rapid Solidification / Mechanical Grinding / Microstructure / Hydrogen Absorbing Characteristics / Hydrogen Desorbing Characteristics / Hydrogen Absorbing Kinetics / Mg_2Ni合金 / 水素吸蔵合金 / 組織制御 / 水素吸蔵量 / 水素吸蔵速度 / プラトー圧力
Research Abstract

In this study, for improvement in performance of batteries used in electric vehicles, we paid attention to Mg_2Ni protium absorbing alloy that has high protium absorption capacity, lightweight and low price as compared with the existing protium absorbing alloys. But Mg_2Ni alloy has high protium absorption and desorption temperature and slow hydriding kinetics that must be improved for practical purposes.
Therefore, for the purpose of decreasing protium absorption and desorption temperature and improving protium absorption rate, we did a partial substitution of Mg_2Ni by third alloying elements. Mn, Fe, Co, Cu, Al, Zn and Ag which are expected to decrease the absolute value of hydride formation enthalpy of Mg_2Ni alloy were selected as third substitutional elements. The ternary alloys were also rapidly solidified, and mechanically ground in order to homogenize their microstructure. The microstructures of specimens obtained by these processes were observed and their protium absorbing and … More desorbing characteristics were investigated. Obtained results are summarized as followed ; (1) All activated specimens absorb protium at room temperature and their protium contents are higher than those of specimens before activation that causes new surface formation and an increase in reaction area. (2) Hydriding kinetics curves measurements show that rapidly solidified specimens of Mg_2Ni_<0.9>Co_<0.1> and Mg2Ni_<0.9>Fe_<0.1> alloys have the highest reaction rate. It is considered that Fe and Co substitution accelerated the diffusion of protium in these two alloys and rapid solidification cause the fine microstructure. (3) As the elapsed time after taking specimens out from hydrogen atmosphere increases, the protium desorption temperature decreases and desorbed protium contents increases. Microstmctural changes of the hydride from high temperature phase to low temperature phase probably causes this phenomenon. Similar results can be obtained when manually hydride of manually ground specimens after activation shows the same microstructural change, resulting in improvement of the desorption characteristics. (4) By addition of third alloying elements and Ni substitution, both activation energy and enthalpy for dehydriding decreases.
From the above results, rapid solidification, mechanical grinding and substitution by 3d transition metals for Ni site in Mg_2Ni crystal structure are effective for improving the protium absorbing and desorbing characteristics of Mg_2Ni alloy. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] Hayato Okumura: "Effect of Mechanical Grinding and Substitutional Elements on Strncture and Hydrogen Absorbing Characteristics of Mg_2Ni Intermetallic Compound" Proceedings of International Symposium on Designing, Processing and Properties of Advanced Engineering Materials. 739-744 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayato Okumura: "Microstructures and Hydrogen Absorbing Characteristics of Mg_2Ni Alloys" Proceedings of The International Conference on Magnesium Alloys and Their Applications. 175-180 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 内田 良平: "急冷凝固ならびにメカニカルグラインディングしたMg_2Ni系合金のプロチウム吸蔵特性に及ぼすFe置換の影響" 第94回軽金属学会春期大会講演概要集. 337-338 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 奥村 勇人: "急冷凝固およびMGしたMg_2Ni系合金のミクロ組織およびプロチウム吸蔵特性" 第123回日本金属学会秋期大会講演概要集. 446 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 内田 良平: "Mg_2Ni系プロチウム吸蔵合金の吸蔵・放出特性" 第95回軽金属学会秋期大会講演概要集. 219-220 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 田端 享: "Mg_2Ni系合金のプロチウム吸蔵・放出特性に及ぼす置換元素の影響" 第96回軽金属学会春期大会講演概要集. 印刷中.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Okumura, Y.Momokawa, S.Kmado, Y.Kojima, M.Yamamoto and T.Kohno: "Effect of Mechanical Grinding and Substitutional Elements on Structure and Hydrogen Absorbing Characteristics of Mg_2Ni Interetallic Compound" Proceedings of International Symposium on Designing, Proceing and Properties of Advanced Engineering Materials. 739-744 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Okumura, Y.Momokawa, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Microstructure and Hydrogen Absorbing Characteristics of Mg_2Ni Alloys" Proceedings of The International Conference on Magnesium Alloys and Their Applications. 175-180 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Okumura, Y.Momokawa, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Microstructures and Hydrogen Absorbing Characteristics of Rapidly Solidified and Mechanically Ground Mg_2Ni Alloys" Abstracts of the 121^<st> Conference of the Japan Institute of Metals. 199 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Momokawa, H.Okumura, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Influence of Heat Treatment, Rapid Solidification and Mechanical Grinding on Hydrogen Absorption and Desorption Characteristics of Mg_2Ni Alloys" Abstracts of the 93^<st> Conference of Japan Institute of Light Metals. 1-2 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] R.Uchida, H.Okumura, Y.Momokawa, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Effect of Fe Substitution on Protium Absorbing Characteristics of Rapidly Quenched and Mechanically Ground Mg_2Ni Alloys" Abstracts of the 94^<st> Conference of Japan Institute of Light Metals. 337-338 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Okumura, R.Uchida, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Microstructures and Protium Absorbing Characteristics of Rapidly Quenched and Mechanically Ground Mg_2Ni Alloys" Abstracts of the 123^<rd> Conference of the Japan Institute of Metals. 466 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] R.Uchida, H.Okumura, T.Tabata, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: "Protium Absorption and Desorption Characteristics of Mg_2Ni Alloys" Abstracts of the 95^<th> Conference of the Japan Institute of Light Metals. 219-220 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Tabata, H.Okumura, R.Uchida, S.Kamado, Y.Kojima, M.Yamamoto and T.Kohno: ""Effect of Substitutional Elements on Protium Absorption and Desorption Characteristis of Mg_2Ni Alloys"" Abstracts of the 96^<th> Conference of the Japan Institute of Light Metals. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hayato Okumura: "Effect of Mechanical Grinding and Substitutional Elements on Structure and Hydrgen Absorbing Characteristics of Mg_2Ni Intermetallic compound" Proceedings of International Symposium on Designing,Processing and Properties of Advanced Engineering Materials. 739-744 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hayato Okumura: "Microstructure and Hydrogen Absorbing Characteristics of Mg_2Ni Alloys" Proceedings of The International Conference on Magnesium Alloys and Their Applications. 175-180 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 内田良平: "急冷凝固ならびにメカニカルグラインディングしたMg_2Ni系合金のプロチウム吸蔵特性に及ぼすFe置換の影響" 第94回軽金属学会春期大会講演概要集. 337-338 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 奥村勇人: "急冷凝固およびMg_2Ni系合金のミクロ組織およびプロチウム吸蔵特性" 第123回日本金属学会秋期大会講演概要集. 466 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 内田良平: "Mg_2Ni系プロチウム吸蔵合金の吸蔵・放出特性" 第95回軽金属学会秋期大会講演概要集. 219-220 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 田端享: "Mg_2Ni系合金のプロチウム吸蔵・放出特性に及ぼす置換元素の影響" 第96回軽金属学会春期大会. 発表予定. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hayato Okumura: "Effect of Mechanical Grinding and Substitutional Elements on Structure and Hydrogen Absurbing Characteristics of Mg_2Ni Intermetallic Compound" Proceedings of International Symposium on Designing,Processing and Properties of Advanced Engineering Materials. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 奥村勇人: "Mg_2Ni系合金の急冷凝固材ならびにメカニカルグラインディング材のミクロ組織および水素吸蔵特性" 日本金属学会1997年秋期大会講演概要. 199 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 百川裕希: "Mg_2Ni合金の水素吸脱蔵特性に及ぼす熱処理,急冷凝固およびメカニカルグラインティングの影響" 軽金属学会第93回秋期大会講演概要. 1-2 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hayato Okumura: "Microstructure and Hydrogen Absorbing Characteristics of Mg_2Ni Alloys" Proceedings of International Comference on Magnesium Alloys and Their Applications. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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