High resolution transmission electron microscopy studies of σ phase in Ni-based single crystal superalloys

Fei Sun, Jianxin Zhang, Pan Liu, Qiang Feng, Xiaodong Han, Shengcheng Mao

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    By means of high resolution transmission electron microscopy (HRTEM) and high-angle annular dark-field image technique (HAADF), morphological of plate-shaped σ phase and interfacial characteristics between plate-shaped σ phase and γ phase in Ni-based single crystal superalloys have been studied. On the basis of HRTEM observations, an atomic structural interface between σ phase and γ phase with a step has been proposed. σ Phase has the relationship of [0 0 1] γ//[1 1 2̄] σ, (2̄ 2 0) γ//(1̄ 1 0) σ, (2̄2̄ 0) γ//(1 1 1) σ; [0 1 1] γ//[1 1 0] σ, (1 1̄ 1) γ//(0 0 1̄) σ with the γ phase. The compositional characteristics of the σ phase which are rich in more heavy elements, such as W, Re, Cr and Ru, has also been clearly revealed by the HAADF imaging technique and Energy Dispersive X-Ray Spectroscopy (EDS) mapping analysis.

    Original languageEnglish
    Pages (from-to)80-84
    Number of pages5
    JournalJournal of Alloys and Compounds
    Volume536
    DOIs
    Publication statusPublished - 2012 Sep 25

    Keywords

    • HAADF
    • HRTEM
    • Interface structure
    • Segregation
    • Superalloys

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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