Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging

Miho Tomita, Ken'ichi Yokoyama, Kenzo Asaoka, Jun'ichi Sakai

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    The hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9% NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni-Ti superelastic alloy.

    Original languageEnglish
    Pages (from-to)308-315
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume476
    Issue number1-2
    DOIs
    Publication statusPublished - 2008 Mar 15

    Fingerprint

    tensile deformation
    Thermal desorption
    charging
    Hydrogen
    desorption
    hydrogen
    martensite
    Martensite
    Desorption
    unloading
    Temperature
    Unloading
    titanium nickelide
    room temperature
    plastic deformation
    plateaus
    Plastic deformation
    coverings
    Current density

    Keywords

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

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging. / Tomita, Miho; Yokoyama, Ken'ichi; Asaoka, Kenzo; Sakai, Jun'ichi.

    In: Materials Science and Engineering A, Vol. 476, No. 1-2, 15.03.2008, p. 308-315.

    Research output: Contribution to journalArticle

    Tomita, Miho ; Yokoyama, Ken'ichi ; Asaoka, Kenzo ; Sakai, Jun'ichi. / Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging. In: Materials Science and Engineering A. 2008 ; Vol. 476, No. 1-2. pp. 308-315.
    @article{25dc1b5f4aaf4fd38dae0353ff4acc98,
    title = "Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging",
    abstract = "The hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9{\%} NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni-Ti superelastic alloy.",
    keywords = "Hydrogen embrittlement, Ni-Ti, Superelastic alloy, Thermal desorption analysis",
    author = "Miho Tomita and Ken'ichi Yokoyama and Kenzo Asaoka and Jun'ichi Sakai",
    year = "2008",
    month = "3",
    day = "15",
    doi = "10.1016/j.msea.2007.04.104",
    language = "English",
    volume = "476",
    pages = "308--315",
    journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
    issn = "0921-5093",
    publisher = "Elsevier BV",
    number = "1-2",

    }

    TY - JOUR

    T1 - Hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging

    AU - Tomita, Miho

    AU - Yokoyama, Ken'ichi

    AU - Asaoka, Kenzo

    AU - Sakai, Jun'ichi

    PY - 2008/3/15

    Y1 - 2008/3/15

    N2 - The hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9% NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni-Ti superelastic alloy.

    AB - The hydrogen thermal desorption behavior of Ni-Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9% NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni-Ti superelastic alloy.

    KW - Hydrogen embrittlement

    KW - Ni-Ti

    KW - Superelastic alloy

    KW - Thermal desorption analysis

    UR - http://www.scopus.com/inward/record.url?scp=38749130112&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=38749130112&partnerID=8YFLogxK

    U2 - 10.1016/j.msea.2007.04.104

    DO - 10.1016/j.msea.2007.04.104

    M3 - Article

    AN - SCOPUS:38749130112

    VL - 476

    SP - 308

    EP - 315

    JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

    JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

    SN - 0921-5093

    IS - 1-2

    ER -