Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions

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

    Research output: Contribution to journalArticle

    51 Citations (Scopus)

    Abstract

    Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic solutions than in the neutral solutions with the same fluoride concentration. The time to fracture was reduced in both solutions when applied stress exceeded the critical stress for martensite transformation. In the acidic solutions, Ni-Ti superelastic alloy underwent general corrosion and absorbed substantial amounts of hydrogen. Fractographic features suggested that the delayed fracture in the acidic solutions was attributable to hydrogen embrittlement, whereas in the neutral solutions, a different fracture mode appeared associated with localized corrosion only in the vicinity of the fracture initiation area. In the neutral solutions, the amount of absorbed hydrogen was much less than that in the acidic solutions, and the delayed fracture was likely to be induced by active path corrosion accompanying hydrogen absorption. The results of the present study imply that the hydrogen-related degradation of performance of Ni-Ti superelastic alloys occurs in the presence of fluoride.

    Original languageEnglish
    Pages (from-to)105-113
    Number of pages9
    JournalJournal of Biomedical Materials Research - Part A
    Volume69
    Issue number1
    Publication statusPublished - 2004 Apr 1

    Fingerprint

    Fluorides
    Hydrogen
    Corrosion
    titanium nickelide
    Degradation
    Thermal desorption
    Hydrogen embrittlement
    Martensite
    Mechanical properties

    Keywords

    • Corrosion
    • Delayed fracture
    • Fluoride
    • Hydrogen embrittlement
    • Ni-Ti

    ASJC Scopus subject areas

    • Biomedical Engineering
    • Biomaterials

    Cite this

    Yokoyama, K., Kaneko, K., Moriyama, K., Asaoka, K., Sakai, J., & Nagumo, M. (2004). Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions. Journal of Biomedical Materials Research - Part A, 69(1), 105-113.

    Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions. / Yokoyama, Ken'ichi; Kaneko, Kazuyuki; Moriyama, Keiji; Asaoka, Kenzo; Sakai, Jun'ichi; Nagumo, Michihiko.

    In: Journal of Biomedical Materials Research - Part A, Vol. 69, No. 1, 01.04.2004, p. 105-113.

    Research output: Contribution to journalArticle

    Yokoyama, K, Kaneko, K, Moriyama, K, Asaoka, K, Sakai, J & Nagumo, M 2004, 'Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions', Journal of Biomedical Materials Research - Part A, vol. 69, no. 1, pp. 105-113.
    Yokoyama K, Kaneko K, Moriyama K, Asaoka K, Sakai J, Nagumo M. Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions. Journal of Biomedical Materials Research - Part A. 2004 Apr 1;69(1):105-113.
    Yokoyama, Ken'ichi ; Kaneko, Kazuyuki ; Moriyama, Keiji ; Asaoka, Kenzo ; Sakai, Jun'ichi ; Nagumo, Michihiko. / Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions. In: Journal of Biomedical Materials Research - Part A. 2004 ; Vol. 69, No. 1. pp. 105-113.
    @article{caac0347b0e746e08eb7ebf7bffeb0d1,
    title = "Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions",
    abstract = "Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic solutions than in the neutral solutions with the same fluoride concentration. The time to fracture was reduced in both solutions when applied stress exceeded the critical stress for martensite transformation. In the acidic solutions, Ni-Ti superelastic alloy underwent general corrosion and absorbed substantial amounts of hydrogen. Fractographic features suggested that the delayed fracture in the acidic solutions was attributable to hydrogen embrittlement, whereas in the neutral solutions, a different fracture mode appeared associated with localized corrosion only in the vicinity of the fracture initiation area. In the neutral solutions, the amount of absorbed hydrogen was much less than that in the acidic solutions, and the delayed fracture was likely to be induced by active path corrosion accompanying hydrogen absorption. The results of the present study imply that the hydrogen-related degradation of performance of Ni-Ti superelastic alloys occurs in the presence of fluoride.",
    keywords = "Corrosion, Delayed fracture, Fluoride, Hydrogen embrittlement, Ni-Ti",
    author = "Ken'ichi Yokoyama and Kazuyuki Kaneko and Keiji Moriyama and Kenzo Asaoka and Jun'ichi Sakai and Michihiko Nagumo",
    year = "2004",
    month = "4",
    day = "1",
    language = "English",
    volume = "69",
    pages = "105--113",
    journal = "Journal of Biomedical Materials Research - Part A",
    issn = "1549-3296",
    publisher = "Heterocorporation",
    number = "1",

    }

    TY - JOUR

    T1 - Delayed fracture of Ni-Ti superelastic alloys in acidic and neutral fluoride solutions

    AU - Yokoyama, Ken'ichi

    AU - Kaneko, Kazuyuki

    AU - Moriyama, Keiji

    AU - Asaoka, Kenzo

    AU - Sakai, Jun'ichi

    AU - Nagumo, Michihiko

    PY - 2004/4/1

    Y1 - 2004/4/1

    N2 - Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic solutions than in the neutral solutions with the same fluoride concentration. The time to fracture was reduced in both solutions when applied stress exceeded the critical stress for martensite transformation. In the acidic solutions, Ni-Ti superelastic alloy underwent general corrosion and absorbed substantial amounts of hydrogen. Fractographic features suggested that the delayed fracture in the acidic solutions was attributable to hydrogen embrittlement, whereas in the neutral solutions, a different fracture mode appeared associated with localized corrosion only in the vicinity of the fracture initiation area. In the neutral solutions, the amount of absorbed hydrogen was much less than that in the acidic solutions, and the delayed fracture was likely to be induced by active path corrosion accompanying hydrogen absorption. The results of the present study imply that the hydrogen-related degradation of performance of Ni-Ti superelastic alloys occurs in the presence of fluoride.

    AB - Hydrogen-related degradation of the mechanical properties of a Ni-Ti superelastic alloy has been examined by means of delayed fracture tests in acidic and neutral fluoride solutions and hydrogen thermal desorption analysis. Delayed fracture took place in both solutions; the time to fracture was shorter in the acidic solutions than in the neutral solutions with the same fluoride concentration. The time to fracture was reduced in both solutions when applied stress exceeded the critical stress for martensite transformation. In the acidic solutions, Ni-Ti superelastic alloy underwent general corrosion and absorbed substantial amounts of hydrogen. Fractographic features suggested that the delayed fracture in the acidic solutions was attributable to hydrogen embrittlement, whereas in the neutral solutions, a different fracture mode appeared associated with localized corrosion only in the vicinity of the fracture initiation area. In the neutral solutions, the amount of absorbed hydrogen was much less than that in the acidic solutions, and the delayed fracture was likely to be induced by active path corrosion accompanying hydrogen absorption. The results of the present study imply that the hydrogen-related degradation of performance of Ni-Ti superelastic alloys occurs in the presence of fluoride.

    KW - Corrosion

    KW - Delayed fracture

    KW - Fluoride

    KW - Hydrogen embrittlement

    KW - Ni-Ti

    UR - http://www.scopus.com/inward/record.url?scp=1642408779&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=1642408779&partnerID=8YFLogxK

    M3 - Article

    C2 - 14999757

    AN - SCOPUS:1642408779

    VL - 69

    SP - 105

    EP - 113

    JO - Journal of Biomedical Materials Research - Part A

    JF - Journal of Biomedical Materials Research - Part A

    SN - 1549-3296

    IS - 1

    ER -