Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions

Ken'ichi Yokoyama, Kazuyuki Kaneko, Toshio Ogawa, Keiji Moriyama, Kenzo Asaoka, Jun'Ichi Sakai

    Research output: Contribution to journalArticle

    45 Citations (Scopus)

    Abstract

    Hydrogen embrittlement of work-hardened Ni-Ti alloy has been examined in acidulated phosphate fluoride (APF) solutions. Upon immersion in a 2.0% APF solution with a pH of 5.0, tensile strength decreased markedly with immersion time. Moreover, the fracture mode changed from ductile to brittle due to brittle layer formation at the peripheral part of the cross section of the specimen. The amount of absorbed hydrogen increased linearly with immersion time, and it reached above 5000 mass ppm after 24h. The hydrogen desorption temperature of the immersed specimens shifted from 450°C to a lower temperature with immersion time. As the amount of absorbed hydrogen was larger than 500 mass ppm, the degradation of mechanical properties was recognized. Although the tensile properties and fracture mode scarcely change in a 0.2% APF solution, the slight reduction in hardness and hydrogen absorption of several hundreds mass ppm were observed. The results of the present study imply that work-hardened Ni-Ti alloy is less sensitive to hydrogen embrittlement compared with Ni-Ti superelastic alloy.

    Original languageEnglish
    Pages (from-to)101-108
    Number of pages8
    JournalBiomaterials
    Volume26
    Issue number1
    DOIs
    Publication statusPublished - 2005 Jan

    Fingerprint

    Acidulated Phosphate Fluoride
    Hydrogen embrittlement
    Fluorides
    Hydrogen
    Immersion
    Phosphates
    Tensile properties
    Desorption
    Temperature
    Tensile strength
    Tensile Strength
    Hardness
    Degradation
    Mechanical properties
    titanium nickelide

    Keywords

    • Corrosion
    • Fluoride
    • Hydrogen embrittlement
    • Ni-Ti

    ASJC Scopus subject areas

    • Biotechnology
    • Bioengineering
    • Biomedical Engineering

    Cite this

    Yokoyama, K., Kaneko, K., Ogawa, T., Moriyama, K., Asaoka, K., & Sakai, JI. (2005). Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions. Biomaterials, 26(1), 101-108. https://doi.org/10.1016/j.biomaterials.2004.02.009

    Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions. / Yokoyama, Ken'ichi; Kaneko, Kazuyuki; Ogawa, Toshio; Moriyama, Keiji; Asaoka, Kenzo; Sakai, Jun'Ichi.

    In: Biomaterials, Vol. 26, No. 1, 01.2005, p. 101-108.

    Research output: Contribution to journalArticle

    Yokoyama, K, Kaneko, K, Ogawa, T, Moriyama, K, Asaoka, K & Sakai, JI 2005, 'Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions', Biomaterials, vol. 26, no. 1, pp. 101-108. https://doi.org/10.1016/j.biomaterials.2004.02.009
    Yokoyama K, Kaneko K, Ogawa T, Moriyama K, Asaoka K, Sakai JI. Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions. Biomaterials. 2005 Jan;26(1):101-108. https://doi.org/10.1016/j.biomaterials.2004.02.009
    Yokoyama, Ken'ichi ; Kaneko, Kazuyuki ; Ogawa, Toshio ; Moriyama, Keiji ; Asaoka, Kenzo ; Sakai, Jun'Ichi. / Hydrogen embrittlement of work-hardened Ni-Ti alloy in fluoride solutions. In: Biomaterials. 2005 ; Vol. 26, No. 1. pp. 101-108.
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