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Development of novel Mg-based ternary alloys with high hydrogen storage capacity

Research Project

Project/Area Number 11225204
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionTohoku University

Principal Investigator

TAKAMURA Hitoshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (30250715)

Co-Investigator(Kenkyū-buntansha) KAMEGAWA Atsunori  Tohoku University, Graduate School of Engineering, Research Associate, 大学院, 助手 (90292242)
Project Period (FY) 1999 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥25,500,000 (Direct Cost: ¥25,500,000)
Fiscal Year 2002: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2001: ¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 2000: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1999: ¥6,700,000 (Direct Cost: ¥6,700,000)
KeywordsHigh-pressure synthesis / Novel hydrides / Hydrogen storage materials / First principle calculation / HDDR phenomena / AZ-series alloys / Grain-size refinement / Mg-based alloys / Mg-Y系高圧水素化物 / HDDR法 / Mg-Ca系水素化物 / Mg-Y系水素化物 / Mg-Mn系水素化物 / CsCl型構造 / 水素化物 / プロチウム化物 / 熱的安定性 / Mg-Y-M系合金 / Mg-Al-M系合金 / 水素吸蔵合金 / 水素吸蔵放出特性 / 不均化反応 / 出現相 / Mg基合金
Research Abstract

Mg-based hydrogen storage alloys are promising in view of high storage capacity. In this study, novel Mg-based hydrides were explored in 1) MgH_2-TM (TM = Mn, Fe, Co, Ni, Cu), 2) MgH_2-CaH_2-Ni, and 3) MgH_2-REH_3 (RE = Y, La) systems by using a cubic anvil-type high-pressure apparatus. The high-pressure apparatus used was capable of generating pseudo-isostatic pressure as high as 6 GPa. As a result, novel hydrides of Mg_2Ni_3H_<3.4> (orthorhombic), Mg_3MnH_<5.6> (monoclinic), (Ca_<0.6>Mg<0.4>)_2NiH_x (BCC), MgCaH_4 (BCC), MgY_2H_<7.8> (FCC), Mg_3LaH_9 (tetragonal) were prepared under high pressure range of 3〜5 GPa. With respect to a hydrogen content, Mg_3MnH_<5.6> was found to have 4.2 mass% of hydrogen. These novel high-pressure hydrides decomposed along with hydrogen desorption in the temperature range of 460〜650 K except for MgY_2H_<7.8>. MgY_2H_<7.8> was able to hold its crystal structure even after partial hydrogen desorption at 600 K. From first principle calculations, it was found that, for MgY_2H_<7.8>, emitted hydrogen originated from O-sites, and remaining hydrogen on T-sites played an important role for holding the crystal structure. The first principle calculation also supported the lattice expansion after the partial hydrogen desorption. In addition to exploring novel hydrides, the effects of hydrogen treatments on the grain size of AZ31 alloys were investigated. As a result of optimization of hydrogenation and dehydrogenation conditions, it was found that MgH_2, Al, Mg_<0.42>Al_<0.58> phases appeared after hydrogenation (disproportionation process), and an original solid solution phase was reformed after dehydrogenation (recombination process). The AZ31 alloys subjected to the HDDR phenomena was found to have fine grain size of around 100 nm. The hydrogen treatments were also applied to plate-shape AZ31 samples. In such case, the surface area of 20 μm in thickness was HDDR-treated.

Report

(5 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (39 results)

All Other

All Publications (39 results)

  • [Publications] H.Takamura: "Preparation and Protium Absorbing Properties of Mg-based Ternary Alloys"Materials Science Forum. 350-351. 315-320 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Kakuta: "Thermal Stability of Hydrides of Magnesium Transition Metal System Prepared Under a High Pressure"Materials Science Forum. 350-351. 329-332 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Protium Absorption Properties of Mg Al Based Ternary Alloys"Mater.Trans.JIM. 41. 1142-1145 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "High-pressure synthesis of hydrides in Ca-Mg-Ni systems"Mater.Trans.. 42. 1301-1304 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides with Cubic Structures in Mg-Ca-Ni Systems by Using High Pressure"Mater.Trans.. 42. 1850-1853 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides with Cubic Structures in Mg-Ca-Ni Systems by Using High Pressure"Proceedings of The Fourth Pacific Rim International Conference on Advanced Materials and Processing. 1219-1222 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Miyashita: "Microstructural Evolution of Mg Al Based Alloy by HDDR"Proceedings of The Fourth Pacific Rim International Conference on Advanced Materials and Processing. 1227-1230 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Crystal Structure of Novel Hydrides in a Mg-Ni-H Systems Prepared under an Ultra High Pressure"J.Alloys Comp.. 330-332. 157-161 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides in Mg -Y Systems by Using High Pressure"Mater.Trans.. 43. 2717-2720 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Kamegawa: "Microstructural Evolution of the Surface of Mg-Al-Based Alloys by Hydrogen Treatment"Materials Science Forum. 419-422. 931-936 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "High-Pressure Synthesis of Novel Hydrides in Mg RE Systemsand Their Hydrogen Content (RE = Y, La)"Materials Science Forum. 419-422. 983-988 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Grain Size Refinement in Mg-Al-Based Alloys by Hydrogen Treatment"J.Alloys Comp.. 44. 583-588 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "The Electronic Structure of MgY_2H_<6+δ> High-Pressure Hydride"Mater.Trans.. 45. 1350-1354 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Preparation and Protium Absorbing Properties of Mg-based Ternary Alloys"Materials Science Forum. 350-351. 315-320 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Kakuta: "Thermal Stability of Hydrides of Magnesium-Transition Metal System Prepared Under a High Pressure"Materials Science Forum. 350-351. 329-332 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Protium Absorption Properties of Mg-Al Based Ternary Alloys"Mater. Trans. JIM. 41. 1142-1145 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "High-pressure synthesis of hydrides in Ca-Mg-Ni systems"Mater. Trans.. 42. 1301-1304 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides with Cubic Structures in Mg-Ca-Ni Systems by Using High Pressure"Mater. Trans.. 42. 1850-1853 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides with Cubic Structures in Mg-Ca-Ni Systems by Using High Pressure"Proceedings of The Fourth Pacific Rim International Conference on Advanced Materials and Processing. 1219-1222 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Miyashita: "Microstructural Evolution of Mg-Al Based Allioy by HDDR"Proceedings of The Fourth Pacific Rim International Conference on Advanced Materials and Processing. 1227-1230 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Crystal Structure of Novel Hydrides in a Mg-Ni-H Systems Prepared under an Ultra High Pressure"J. Alloys Comp.. 330-332. 157-161 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Goto: "Synthesis of New Hydrides in Mg-Y Systems by Using High Pressure"Mater. Trans.. 43. 2717-2720 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Kamegawa: "Microstructural Evolution of the Surface of Mg-Al-Based Alloys by Hydrogen Treatment"Materials Science Forum. 419-422. 931-936 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "High-Pressure Synthesis of Novel Hydrides in Mg-RE Systemsand Their Hydrogen Content (RE=Y, La)"Materials Science Forum. 419-422. 983-988 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "Grain Size Refinement in Mg-Al-Based Alloys by Hydrogen Treatment"J. Alloys Comp.. 356-357. 804-808 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura: "The Electronic Structure of MgY_2H_<6+δ> High-Pressure Hydride"Mater. Trans.. 44. 583-588 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Watanabe: "High Pressure Synthesis of Novel Compounds in Mg-TM Systems (TM=Ti〜Zn)"Mater. Trans.. 45. 1350-1354 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Takamura et al.: "High-Pressure Synthesis of Novel Hydrides in Mg-RE Systems and Their Hydrogen Content (RE = Y, La)"Materials Science Forum. 419-422. 983-988 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.Kamegawa et al.: "Microstructural Evolution of the Surface of Mg-Al-Based Alloy by Hydrogen Treatment"Materials Science Forum. 419-422. 931-936 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Takamura et al.: "Grain-size refinement in Mg-Al-based alloys by hydrogen treatment"J. Alloys Comp.. (accepted).

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Takamura et al.: "The Electronic Structure of MgY_2H_<6+δ> High-Pressure Hydride"Mater.Trans.. (accepted).

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Kakuta et al.: "High-Pressure Synthesis of Hydrides of Ca -TM Systems (TM=Mn, Fe, Co and Ni)"Mater Trans. JIM. 42(3). 443-445 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Takamura et al.: "High-Pressure Synthesis of Hydrides in Ca-Mg-Ni Systems"Mater. Trans. JIM. 42(7). 1301-1304 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Takamura et al.: "Crystal structure of novel hydrides in a Mg-Ni-H system prepared under an ultra high pressure"J. Alloys Comp.. 332-332. 157-161 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Takamura et al.: "Preparation and Protium Absorbing Properties of Mg-based Ternary Alloys"Materials Science Forum. 350-351. 315-320 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kakuta et al.: "Thermal Stability of Hydrides of Magnesium-Transition Metal System Prepared Under a High Pressure"Materials Science Forum. 350-351. 329-332 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Takamura et al.: "Protium Absorption Properties of Mg-Al Based Ternary Alloys"Mater.Trans.JIM. 41. 1142-1145 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kakuta et al.: "High-Pressure Synthesis of Hydrides of Ca - TM Systems (TM=Mn,Fe,Co and Ni)"Mater.Trans.JIM. 42(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Takamura et al.: "Crystal structure of novel hydrides in a Mg-Ni-H system prepared under an ultra high pressure"J.Alloys Comp.. (accepted).

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2018-03-28  

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