OS1202 NbTiCo複相合金の水素吸蔵による結晶変形挙動(X線,放射光,中性子による材料・材料強度評価,オーガナイズドセッション)

概要

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Microscopic deformation of each crystal of duplex phases of Nb-Ti-Co alloys due to hydrogen absorption was investigated by X-ray diffraction technique. Nb_<40>Ti_<30>Co_<30> which is hydrogen permeation alloy and consists of the primary phase, NbTi, and the eutectic phases, NbTi + TiCo, was used as a specimen. The change of lattice spacing of the specimen during hydrogen absorption was measured by Cu-Kα characteristic X-ray. As a result, the lattice spacing of crystal of NbTi phase increased extremely, while that of TiCo phase increased slightly. It was pointed out that the NbTi phase is responsible for hydrogen absorption in the Nb-Ti-Co alloy. When hydrogen gas was released from the specimen at high temperature, both lattice spacing returned nearly to those of them before hydrogen absorption. The specimen kept on its original shape after the experiment, many small cracks, however, occurred on the surface.
一般社団法人日本機械学会の論文
2009-07-24