Characterization of creep deformation of Ni-Cr solid solution alloy Nimonic 75

Robert W. Hayes, Francis Azzarto, Elissa A. Klopfer, Martin A. Crimp

    Research output: Research - peer-reviewArticle

    Abstract

    Creep testing of Nimonic alloy 75, a simple Ni-Cr solid solution alloy was carried out over the temperature range 873–950 K (600–677 °C) at 160 MPa. The activation energy for creep was found to vary over this temperature range, and suggests that two deformation processes occur simultaneously, dislocation climb within the grains along with grain boundary (Coble) diffusional creep. Under these conditions the material also exhibits a sigmoidal rather than normal primary creep transient. Despite this, the characteristics of Class I solid solution creep are not observed. The sigmoidal primary transient is explained in terms of a transition from dislocation mobility-controlled (initial stage of sigmoidal primary transient) to substructure-controlled deformation (second stage of sigmoidal primary transient). A reduction in sample size has been found to reduce the early stage creep resistance of this material. This size effect is analyzed in terms of the sample volume to surface area ratio (V/S) and agrees well with size effect results reported in the literature.

    LanguageEnglish (US)
    Pages453-462
    Number of pages10
    JournalMaterials Science and Engineering A
    Volume690
    DOIs
    StatePublished - Apr 6 2017

    Profile

    nimonic alloys
    solid solutions
    Solid solutions
    Creep
    temperature
    Temperature
    creep strength
    substructures
    grain boundaries
    activation energy
    Creep testing
    Creep resistance
    Dislocations (crystals)
    Grain boundaries
    Activation energy

    Keywords

    • Creep
    • Deformation
    • Solid solution

    ASJC Scopus subject areas

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

    Cite this

    Characterization of creep deformation of Ni-Cr solid solution alloy Nimonic 75. / Hayes, Robert W.; Azzarto, Francis; Klopfer, Elissa A.; Crimp, Martin A.

    In: Materials Science and Engineering A, Vol. 690, 06.04.2017, p. 453-462.

    Research output: Research - peer-reviewArticle

    Hayes, Robert W. ; Azzarto, Francis ; Klopfer, Elissa A. ; Crimp, Martin A./ Characterization of creep deformation of Ni-Cr solid solution alloy Nimonic 75. In: Materials Science and Engineering A. 2017 ; Vol. 690. pp. 453-462
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