Abstract
This paper includes some results of “Hydrogen-Induced New Functions in Sub-Nano Lattice Matters” accomplished by MEXT's program “Elements strategy Project”. In the 21st century, the era concerning about environment, this research achievement utilizing hydrogen as the technology for strengthening alloys will be expected to make a breakthrough in the metal heat-treatment and processing technology as the new environmental conscious process. Hydrogen heat-treatments for grain-size refinements of alloys were performed. The grain size of Cu-3 mass%Ti alloy turned into about 20~50 nm after hydrogenation and dehydrogenation treatment. Moreover, grain-size refined Ti-based alloy showed large super-elastic elongation. On the other hand, hydrogen induced functions in the alloys were also investigated. Hydrogen transmitting films with Pd nanogranular particles dispersed in ceramic material were developed as attachment of metal-hydride switchable mirrors. Metamagnetism transition temperature (Tc) could be increased by hydrogen introduction in La(FexSi1-x)13. Pd/Pt core-shell type nano-particles were also investigated.
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