Aluminizing for enhanced oxidation resistance of ductile refractory high-entropy alloys

Saad Sheikh, Lu Gan, Te Kang Tsao, Hideyuki Murakami, Samrand Shafeie, Sheng Guo

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Refractory high-entropy alloys (RHEAs) emerge as promising candidate materials for ultrahigh-temperature applications. One critical issue to solve for RHEAs is their balanced oxidation resistance and mechanical properties, mainly room-temperature ductility for the latter. Recently, it was found that existing ductile RHEAs are subject to catastrophic accelerated oxidation, also known as pesting. In this work, both alloying and surface coating, are applied to enhance the oxidation resistance of ductile RHEAs, with the focus on surface coating using the pack cementation method and more specifically, aluminizing. The oxidation resistance of two RHEAs, Hf0.5Nb0.5Ta0.5Ti1.5Zr, one recently identified ductile RHEA which pests in the temperature range of 600–1000 °C, and Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, the newly designed ductile RHEA which does not pest but embrittles after oxidation, are studied after aluminizing at 900 °C using three different pack components. Aluminizing, if using the appropriate pack cementation parameters, can avoid pesting in Hf0.5Nb0.5Ta0.5Ti1.5Zr and alleviate the oxidation induced embrittlement in Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, and holds the promise for further improving the RHEAs as potential ultrahigh-temperature materials.

    Original languageEnglish
    Pages (from-to)40-51
    Number of pages12
    JournalIntermetallics
    Volume103
    DOIs
    Publication statusPublished - 2018 Dec 1

    Fingerprint

    Oxidation resistance
    Refractory materials
    Entropy
    Oxidation
    Coatings
    Temperature
    Embrittlement
    Alloying
    Ductility
    Mechanical properties

    Keywords

    • Aluminizing
    • Coating
    • Oxidation resistance
    • Pack cementation
    • Refractory high-entropy alloys

    ASJC Scopus subject areas

    • Chemistry(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    Cite this

    Aluminizing for enhanced oxidation resistance of ductile refractory high-entropy alloys. / Sheikh, Saad; Gan, Lu; Tsao, Te Kang; Murakami, Hideyuki; Shafeie, Samrand; Guo, Sheng.

    In: Intermetallics, Vol. 103, 01.12.2018, p. 40-51.

    Research output: Contribution to journalArticle

    Sheikh, Saad ; Gan, Lu ; Tsao, Te Kang ; Murakami, Hideyuki ; Shafeie, Samrand ; Guo, Sheng. / Aluminizing for enhanced oxidation resistance of ductile refractory high-entropy alloys. In: Intermetallics. 2018 ; Vol. 103. pp. 40-51.
    @article{9902aa04be264fa1b9dc6966ac12eda6,
    title = "Aluminizing for enhanced oxidation resistance of ductile refractory high-entropy alloys",
    abstract = "Refractory high-entropy alloys (RHEAs) emerge as promising candidate materials for ultrahigh-temperature applications. One critical issue to solve for RHEAs is their balanced oxidation resistance and mechanical properties, mainly room-temperature ductility for the latter. Recently, it was found that existing ductile RHEAs are subject to catastrophic accelerated oxidation, also known as pesting. In this work, both alloying and surface coating, are applied to enhance the oxidation resistance of ductile RHEAs, with the focus on surface coating using the pack cementation method and more specifically, aluminizing. The oxidation resistance of two RHEAs, Hf0.5Nb0.5Ta0.5Ti1.5Zr, one recently identified ductile RHEA which pests in the temperature range of 600–1000 °C, and Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, the newly designed ductile RHEA which does not pest but embrittles after oxidation, are studied after aluminizing at 900 °C using three different pack components. Aluminizing, if using the appropriate pack cementation parameters, can avoid pesting in Hf0.5Nb0.5Ta0.5Ti1.5Zr and alleviate the oxidation induced embrittlement in Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, and holds the promise for further improving the RHEAs as potential ultrahigh-temperature materials.",
    keywords = "Aluminizing, Coating, Oxidation resistance, Pack cementation, Refractory high-entropy alloys",
    author = "Saad Sheikh and Lu Gan and Tsao, {Te Kang} and Hideyuki Murakami and Samrand Shafeie and Sheng Guo",
    year = "2018",
    month = "12",
    day = "1",
    doi = "10.1016/j.intermet.2018.10.004",
    language = "English",
    volume = "103",
    pages = "40--51",
    journal = "Intermetallics",
    issn = "0966-9795",
    publisher = "Elsevier Limited",

    }

    TY - JOUR

    T1 - Aluminizing for enhanced oxidation resistance of ductile refractory high-entropy alloys

    AU - Sheikh, Saad

    AU - Gan, Lu

    AU - Tsao, Te Kang

    AU - Murakami, Hideyuki

    AU - Shafeie, Samrand

    AU - Guo, Sheng

    PY - 2018/12/1

    Y1 - 2018/12/1

    N2 - Refractory high-entropy alloys (RHEAs) emerge as promising candidate materials for ultrahigh-temperature applications. One critical issue to solve for RHEAs is their balanced oxidation resistance and mechanical properties, mainly room-temperature ductility for the latter. Recently, it was found that existing ductile RHEAs are subject to catastrophic accelerated oxidation, also known as pesting. In this work, both alloying and surface coating, are applied to enhance the oxidation resistance of ductile RHEAs, with the focus on surface coating using the pack cementation method and more specifically, aluminizing. The oxidation resistance of two RHEAs, Hf0.5Nb0.5Ta0.5Ti1.5Zr, one recently identified ductile RHEA which pests in the temperature range of 600–1000 °C, and Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, the newly designed ductile RHEA which does not pest but embrittles after oxidation, are studied after aluminizing at 900 °C using three different pack components. Aluminizing, if using the appropriate pack cementation parameters, can avoid pesting in Hf0.5Nb0.5Ta0.5Ti1.5Zr and alleviate the oxidation induced embrittlement in Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, and holds the promise for further improving the RHEAs as potential ultrahigh-temperature materials.

    AB - Refractory high-entropy alloys (RHEAs) emerge as promising candidate materials for ultrahigh-temperature applications. One critical issue to solve for RHEAs is their balanced oxidation resistance and mechanical properties, mainly room-temperature ductility for the latter. Recently, it was found that existing ductile RHEAs are subject to catastrophic accelerated oxidation, also known as pesting. In this work, both alloying and surface coating, are applied to enhance the oxidation resistance of ductile RHEAs, with the focus on surface coating using the pack cementation method and more specifically, aluminizing. The oxidation resistance of two RHEAs, Hf0.5Nb0.5Ta0.5Ti1.5Zr, one recently identified ductile RHEA which pests in the temperature range of 600–1000 °C, and Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, the newly designed ductile RHEA which does not pest but embrittles after oxidation, are studied after aluminizing at 900 °C using three different pack components. Aluminizing, if using the appropriate pack cementation parameters, can avoid pesting in Hf0.5Nb0.5Ta0.5Ti1.5Zr and alleviate the oxidation induced embrittlement in Al0.5Cr0.25Nb0.5Ta0.5Ti1.5, and holds the promise for further improving the RHEAs as potential ultrahigh-temperature materials.

    KW - Aluminizing

    KW - Coating

    KW - Oxidation resistance

    KW - Pack cementation

    KW - Refractory high-entropy alloys

    UR - http://www.scopus.com/inward/record.url?scp=85054446602&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85054446602&partnerID=8YFLogxK

    U2 - 10.1016/j.intermet.2018.10.004

    DO - 10.1016/j.intermet.2018.10.004

    M3 - Article

    AN - SCOPUS:85054446602

    VL - 103

    SP - 40

    EP - 51

    JO - Intermetallics

    JF - Intermetallics

    SN - 0966-9795

    ER -