Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium

Yuhi Mori, Tadaharu Yokokawa, Toshiharu Kobayashi, Hiroshi Harada, Shinsuke Suzuki

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Phase stability of Ni-base single crystal superalloys was compared between Ir addition and Ru addition. Investigated alloys were TMS-238 and its derivative alloys. The thermodynamic equilibrium microstructures obtained by a strain aging showed that the volume fractions of γ, γ and topologically close packed (TCP) phases in the alloys were virtually the same to each other without depending on Ir substitution for Ru. On the other hand, the time temperature transformation diagrams obtained by an ordinary aging showed a significant delay in TCP precipitation in the alloys with Ir substitution. The delay in the TCP precipitation might be attributed to the smaller interdiffusion coefficient of Ir-Ni, compared with one of Ru-Ni. The smaller interdiffusion coefficient may affect the kinetics of the TCP precipitation.

    Original languageEnglish
    Pages (from-to)1845-1848
    Number of pages4
    JournalMaterials Transactions
    Volume57
    Issue number10
    DOIs
    Publication statusPublished - 2016

    Fingerprint

    Iridium
    Ruthenium
    Phase stability
    heat resistant alloys
    iridium
    Nickel
    Superalloys
    ruthenium
    Single crystals
    nickel
    single crystals
    Substitution reactions
    Aging of materials
    substitutes
    precipitation hardening
    coefficients
    thermodynamic equilibrium
    Volume fraction
    diagrams
    Thermodynamics

    Keywords

    • Iridium
    • Nickel-Base Single Crystal Superalloy
    • Phase Stability
    • Ruthenium
    • Time Temperature Transformation Diagram
    • Topologically Close Packed Phase

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium. / Mori, Yuhi; Yokokawa, Tadaharu; Kobayashi, Toshiharu; Harada, Hiroshi; Suzuki, Shinsuke.

    In: Materials Transactions, Vol. 57, No. 10, 2016, p. 1845-1848.

    Research output: Contribution to journalArticle

    Mori, Yuhi ; Yokokawa, Tadaharu ; Kobayashi, Toshiharu ; Harada, Hiroshi ; Suzuki, Shinsuke. / Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium. In: Materials Transactions. 2016 ; Vol. 57, No. 10. pp. 1845-1848.
    @article{89f8ba286da1441c85cd0c545419d3d2,
    title = "Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium",
    abstract = "Phase stability of Ni-base single crystal superalloys was compared between Ir addition and Ru addition. Investigated alloys were TMS-238 and its derivative alloys. The thermodynamic equilibrium microstructures obtained by a strain aging showed that the volume fractions of γ, γ and topologically close packed (TCP) phases in the alloys were virtually the same to each other without depending on Ir substitution for Ru. On the other hand, the time temperature transformation diagrams obtained by an ordinary aging showed a significant delay in TCP precipitation in the alloys with Ir substitution. The delay in the TCP precipitation might be attributed to the smaller interdiffusion coefficient of Ir-Ni, compared with one of Ru-Ni. The smaller interdiffusion coefficient may affect the kinetics of the TCP precipitation.",
    keywords = "Iridium, Nickel-Base Single Crystal Superalloy, Phase Stability, Ruthenium, Time Temperature Transformation Diagram, Topologically Close Packed Phase",
    author = "Yuhi Mori and Tadaharu Yokokawa and Toshiharu Kobayashi and Hiroshi Harada and Shinsuke Suzuki",
    year = "2016",
    doi = "10.2320/matertrans.MAW201606",
    language = "English",
    volume = "57",
    pages = "1845--1848",
    journal = "Materials Transactions",
    issn = "1345-9678",
    publisher = "Japan Institute of Metals (JIM)",
    number = "10",

    }

    TY - JOUR

    T1 - Phase stability of nickel-base single crystal superalloys containing iridium substituting for ruthenium

    AU - Mori, Yuhi

    AU - Yokokawa, Tadaharu

    AU - Kobayashi, Toshiharu

    AU - Harada, Hiroshi

    AU - Suzuki, Shinsuke

    PY - 2016

    Y1 - 2016

    N2 - Phase stability of Ni-base single crystal superalloys was compared between Ir addition and Ru addition. Investigated alloys were TMS-238 and its derivative alloys. The thermodynamic equilibrium microstructures obtained by a strain aging showed that the volume fractions of γ, γ and topologically close packed (TCP) phases in the alloys were virtually the same to each other without depending on Ir substitution for Ru. On the other hand, the time temperature transformation diagrams obtained by an ordinary aging showed a significant delay in TCP precipitation in the alloys with Ir substitution. The delay in the TCP precipitation might be attributed to the smaller interdiffusion coefficient of Ir-Ni, compared with one of Ru-Ni. The smaller interdiffusion coefficient may affect the kinetics of the TCP precipitation.

    AB - Phase stability of Ni-base single crystal superalloys was compared between Ir addition and Ru addition. Investigated alloys were TMS-238 and its derivative alloys. The thermodynamic equilibrium microstructures obtained by a strain aging showed that the volume fractions of γ, γ and topologically close packed (TCP) phases in the alloys were virtually the same to each other without depending on Ir substitution for Ru. On the other hand, the time temperature transformation diagrams obtained by an ordinary aging showed a significant delay in TCP precipitation in the alloys with Ir substitution. The delay in the TCP precipitation might be attributed to the smaller interdiffusion coefficient of Ir-Ni, compared with one of Ru-Ni. The smaller interdiffusion coefficient may affect the kinetics of the TCP precipitation.

    KW - Iridium

    KW - Nickel-Base Single Crystal Superalloy

    KW - Phase Stability

    KW - Ruthenium

    KW - Time Temperature Transformation Diagram

    KW - Topologically Close Packed Phase

    UR - http://www.scopus.com/inward/record.url?scp=84989862627&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84989862627&partnerID=8YFLogxK

    U2 - 10.2320/matertrans.MAW201606

    DO - 10.2320/matertrans.MAW201606

    M3 - Article

    VL - 57

    SP - 1845

    EP - 1848

    JO - Materials Transactions

    JF - Materials Transactions

    SN - 1345-9678

    IS - 10

    ER -