| Co-Investigator(Kenkyū-buntansha) |
MITSUO Atsushi RCAST, Visiting Researcher, 先端科学技術研究センター, 客員研究員
KUWAHARA Hideyuki RCAST, Visiting Researcher, 先端科学技術研究センター, 客員研究員 (90132795)
KONDOH Katsuyoshi RCAST, Associate Professor, 先端科学技術研究センター, 特任助教授 (50345138)
WENBO Du RCAST, Post-Doctoral Fellow, 先端科学技術研究センター, 特別研究員 (90345166)
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| Research Abstract |
Toward nontraditional functionality of advanced magnesium alloys and compounds, this project is concerning with research and development of hydrogen storage, thermoelectricity and bio-compatible tissues. At the same time, the solid-state processing and forming, the cold-coating and bio-compatible film formation are developed to produce these new magnesium alloys and compounds. Among them, our developed bulk mechanical alloying (BMA) is further promoted for fine control of non-equilibrium phase by amorphization and nano-structuring, for fine control of contents in multi-phase system and for solid-state processing from granules and platelets. At first, Mg-Ni system is employed as a target system for non-equilibration via BMA. Hydrogenation and de-hydrogenation characteristics are significantly improved by this Ni-enrichment via nonequilibration. On this fundamental study in the binary system, material search for ternary alloys becomes promising through BBC-structuring. Mg-Si system is ne
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xt selected to demonstrate the effectiveness of the solid-state processing. In the conventional processings like self-heating synthesis and melting, the formation of Mg_2Si takes place above the melting point of magnesium. This leads to partial reaction to Mg_2Si and coursing of grain size for the synthesized Mg_2Si. In the present method, Mg_2Si is sold-state synthesized at room temperature and the grain size is refined to have the equivalent particle size to that of refined silicon before reaction. On this fundamental knowledge, the solid-state recycling is proposed to fabricate the reinforced composite magnesium alloy parts and performs with in-situ precipitated Mg_2Si in fine and uniform. In addition, various hydrogen storage alloys like Mg_2Co are invented by super-saturation through non-equilibration both in Mg-Co and Mg-Fe systems. The Cold-coating is proposed to make the hydrogen storage films in Mg-Ni/Co/Fe systems even on the polymer substrates. This success enables us to make research and development of new material film systems for fast-rate hydrogenation and de-hydrogenation and to profoundly investigate the functional films with metal-insulator transition through hydrogenation and de-hydrogenation. New dipping method is further invented to yield the hydroxiapatite coating (Hap) on the pure magnesium plate as a bio-compatible film for promotion of recovery of hard tissues. Less
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