Hydrogen embrittlement of Ni-Ti superelastic alloy aged at room temperature after hydrogen charging

Ken'ichi Yokoyama, Toshio Ogawa, Katsutoshi Takashima, Kenzo Asaoka, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    48 Citations (Scopus)

    Abstract

    The hydrogen embrittlement of a Ni-Ti superelastic alloy aged at room temperature (25 °C) in air after hydrogen charging is examined using tensile test and hydrogen thermal desorption analysis (TDA). Cathodic hydrogen charging is performed at a current density of 10 A/m2 for 6 h in 0.9% NaCl aqueous solution at room temperature. For the specimen immediately after hydrogen charging, tensile fracture occurs near the critical stress for martensite transformation without stress-induced martensite transformation. Hydrogen thermal desorption is observed from room temperature to 400 °C. Charged hydrogen exists within approximately 50 μm from the surface of the specimen. Hydride formation is confirmed by X-ray diffraction (XRD) analysis. In contrast, the specimens aged at room temperature after hydrogen charging fracture during or after stress-induced martensite transformation. The amount of hydrogen desorbed at low temperatures (room temperature to 200 °C) decreases. Charged hydrogen diffuses toward the center part of the specimen, and some charged hydrogen diffuses out in the early stage of aging at room temperature. In addition, no XRD peaks corresponding to hydrides are detected. The present results suggest that aging at room temperature in air after hydrogen charging changes the distribution and state of hydrogen in Ni-Ti superelastic alloy, thereby leading to a partial recovery of the tensile properties of the alloy.

    Original languageEnglish
    Pages (from-to)106-113
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume466
    Issue number1-2
    DOIs
    Publication statusPublished - 2007 Sep 25

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    hydrogen embrittlement
    Hydrogen embrittlement
    charging
    Hydrogen
    room temperature
    hydrogen
    Temperature
    martensite
    Martensite
    Thermal desorption
    Hydrides
    hydrides
    titanium nickelide
    Aging of materials
    desorption
    critical loading
    tensile properties
    air
    tensile tests
    Air

    Keywords

    • Corrosion
    • Hydrogen embrittlement
    • Ni-Ti
    • Superelastic alloy
    • Thermal desorption analysis

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Hydrogen embrittlement of Ni-Ti superelastic alloy aged at room temperature after hydrogen charging. / Yokoyama, Ken'ichi; Ogawa, Toshio; Takashima, Katsutoshi; Asaoka, Kenzo; Sakai, Jun'ichi.

    In: Materials Science and Engineering A, Vol. 466, No. 1-2, 25.09.2007, p. 106-113.

    Research output: Contribution to journalArticle

    Yokoyama, Ken'ichi ; Ogawa, Toshio ; Takashima, Katsutoshi ; Asaoka, Kenzo ; Sakai, Jun'ichi. / Hydrogen embrittlement of Ni-Ti superelastic alloy aged at room temperature after hydrogen charging. In: Materials Science and Engineering A. 2007 ; Vol. 466, No. 1-2. pp. 106-113.
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    AB - The hydrogen embrittlement of a Ni-Ti superelastic alloy aged at room temperature (25 °C) in air after hydrogen charging is examined using tensile test and hydrogen thermal desorption analysis (TDA). Cathodic hydrogen charging is performed at a current density of 10 A/m2 for 6 h in 0.9% NaCl aqueous solution at room temperature. For the specimen immediately after hydrogen charging, tensile fracture occurs near the critical stress for martensite transformation without stress-induced martensite transformation. Hydrogen thermal desorption is observed from room temperature to 400 °C. Charged hydrogen exists within approximately 50 μm from the surface of the specimen. Hydride formation is confirmed by X-ray diffraction (XRD) analysis. In contrast, the specimens aged at room temperature after hydrogen charging fracture during or after stress-induced martensite transformation. The amount of hydrogen desorbed at low temperatures (room temperature to 200 °C) decreases. Charged hydrogen diffuses toward the center part of the specimen, and some charged hydrogen diffuses out in the early stage of aging at room temperature. In addition, no XRD peaks corresponding to hydrides are detected. The present results suggest that aging at room temperature in air after hydrogen charging changes the distribution and state of hydrogen in Ni-Ti superelastic alloy, thereby leading to a partial recovery of the tensile properties of the alloy.

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