Effects of the hydrogen absorption conditions on the hydrogen embrittlement behavior of Ni-Ti superelastic alloy

Ken'ichi Yokoyama*, Akira Nagaoka, Jun'ichi Sakai

*この研究の対応する著者

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    The present study has investigated whether the hydrogen embrittlement behavior of Ni-Ti superelastic alloy can be changed by modifying the hydrogen absorption conditions. Upon immersion in H 2SO 4 or H 3PO 4 solution, the stress plateau due to the stress-induced martensite transformation becomes unclear and forms a gentle slope. In addition, the superelastic strain decreases with increasing immersion time. The peripheral part of the fracture surface of the immersed specimens is flat as usual, whereas the center part of the fracture surface is rough compared with that under other hydrogen absorption conditions reported previously. For the specimens immersed in H 3PO 4 solution, hydrogen thermal desorption tends to be observed at higher temperatures compared with the specimens immersed in H 2SO 4 solution. Moreover, for a longer immersion time, a second peak of hydrogen desorption is observed at a high temperature, indicating that the hydrogen states change with the hydrogen absorption conditions. The results of this study suggest that changing the hydrogen embrittlement behavior by modifying the hydrogen absorption conditions may enable the determination of the embrittlement mechanism of the alloy. ent.

    本文言語English
    ページ(範囲)255-262
    ページ数8
    ジャーナルISIJ International
    52
    2
    DOI
    出版ステータスPublished - 2012

    ASJC Scopus subject areas

    • 機械工学
    • 材料力学
    • 材料化学
    • 金属および合金

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