Hydriding properties of the mechanically deformed Mg-Ni alloys

Kazutaka Ikeda, Yuko Nakamori, Shin Ichi Orimo

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Mechanical deformations with/without elemental substitutions have been carried out on Mg-Ni-based alloys to improve their hydriding properties. The alloys Mg-x at.%Ni (x = 33, 38, 43 and 50) with different nanometer-scale structures were successively synthesized by mechanical milling of Mg 2Ni mixed with various amounts of additional Ni, and the relations between their structural and hydriding properties were investigated in detail. By milling only Mg2Ni, nanostructured Mg2Ni composed of the intra- and inter-grain regions was obtained (x = 33). Amorphous MgNi (a-MgNi) as a third region was dispersed around the nanostructured Mg 2Ni by milling of Mg2Ni mixed with additional Ni (x = 38 and 43), and the pure amorphous MgNi was homogeneously synthesized in equivalent composition (x = 50). The coordination numbers and interatomic distances of the Mg-D and Ni-D correlations in the amorphous MgNi-D show that deuterium occupies the interstitial tetrahedral site composed of nearly [2Mg2Ni]. According to the specific structural properties, there is obvious miscibility gap (plateau) pressure higher than 1 × 10-4 MPa at room temperature even in the amorphous phase, and the total hydrogen content reached up to 2.2 mass%. Further studies on an amorphous MgNi-based system were carried out to clarify the effect of the short-range ordering on the structural and hydriding properties due to substitution of Mg- and Ni-sites by various elements.

本文言語English
ホスト出版物のタイトルNanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
出版社Trans Tech Publications Ltd
ページ499-504
ページ数6
ISBN(印刷版)0878499857, 9780878499854
DOI
出版ステータスPublished - 2006
イベント3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3 - Fukuoka, Japan
継続期間: 2005 9 222005 9 26

出版物シリーズ

名前Materials Science Forum
503-504
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3
国/地域Japan
CityFukuoka
Period05/9/2205/9/26

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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