Fracture of Ni-Ti superelastic alloy under sustained tensile load in physiological saline solution containing hydrogen peroxide

Ken'ichi Yokoyama, Toshio Ogawa, Atsushi Fujita, Kenzo Asaoka, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    The fracture of Ni-Ti superelastic alloy has been investigated by a sustained tensile-loading test in physiological saline solution containing hydrogen peroxide (0.15M NaCl + 0.3M H2O2). The fracture always occurs when the applied stress exceeds the critical stress for martensite transformation. In contrast, under a low applied stress, the fracture does not always occur within 1000 h. The fracture is probably mainly caused by localized corrosion associated with the preferential dissolution of nickel ions. In 0.3M H2O2 solution without NaCl, the fracture does not occur even under a high applied stress. The results of the present study imply that one reason for the fracture of the Ni-Ti superelastic alloy in vivo is localized corrosion due to the synergistic effects of hydrogen peroxide and sodium chloride under applied stress.

    Original languageEnglish
    Pages (from-to)558-567
    Number of pages10
    JournalJournal of Biomedical Materials Research - Part A
    Volume82
    Issue number3
    DOIs
    Publication statusPublished - 2007 Sep 1

    Keywords

    • Corrosion
    • Fracture
    • Hydrogen peroxide
    • Ni-Ti

    ASJC Scopus subject areas

    • Biomedical Engineering
    • Biomaterials

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