Hydrogen embrittlement of Ni-Ti superelastic alloy in fluoride solution

Ken'Ichi Yokoyama*, Kazuyuki Kaneko, Keiji Moriyama, Kenzo Asaoka, Jun'Ichi Sakai, Michihiko Nagumo

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    87 Citations (Scopus)


    Hydrogen embrittlement of Ni-Ti superelastic alloy in a fluoride solution (0.2% APF) has been investigated by means of a tensile test (after immersion) and hydrogen thermal desorption analysis. Upon immersion, the tensile strength of the alloy decreased to the critical stress level of martensite transformation. Hydrogen desorption of the immersed specimens appeared with a peak at around 500°C. The amount of absorbed hydrogen in the alloy ranged from 100 to 1000 mass ppm when immersed in the fluoride solution for 2 to 24 h. The immersion in the fluoride solution led to the degradation of mechanical properties due to hydrogen embrittlement. The results of the present study imply that one reason that Ti and its alloys fracture in the oral cavity is the fact that hydrogen is absorbed in a fluoride solution, such as prophylactic agents.

    Original languageEnglish
    Pages (from-to)182-187
    Number of pages6
    JournalJournal of Biomedical Materials Research - Part A
    Issue number2
    Publication statusPublished - 2003 May 1


    • Corrosion
    • Fluoride
    • Hydrogen embrittlement
    • Ni-Ti

    ASJC Scopus subject areas

    • Biomedical Engineering
    • Biomaterials


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