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Interphase interface structure and evolution of a single crystal Ni-based superalloy based on HRTEM image analysis.

Ruijun He, Hongye Zhang, Zhanwei Liu

    Applied Optics
    |February 24, 2022
    PubMed
    Summary

    This study introduces advanced methods to measure the interface structure and lattice spacing in single crystal Ni-based superalloys (SCNBS) at high temperatures. Findings reveal how temperature affects lattice misfit and interface width in these critical materials.

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    Area of Science:

    • Materials Science
    • Metallurgy
    • Solid State Physics

    Background:

    • Interfaces significantly influence multiphase system properties.
    • Accurate measurement of interface structure in single crystal Ni-based superalloys (SCNBS) is crucial under varying conditions.

    Purpose of the Study:

    • To detail a subpixel accuracy transform method for measuring SCNBS lattice spacing at high temperatures.
    • To analyze SCNBS interface width using intensity ratio analysis on high-resolution transmission electron microscopy images.
    • To investigate the evolution of lattice spacing and misfit in SCNBS at elevated temperatures.

    Main Methods:

    • Subpixel accuracy transform method for lattice spacing measurement.
    • Intensity ratio analysis on high-resolution transmission electron microscopy (HRTEM) images for interface width.
    • In-situ high-temperature measurements.

    Main Results:

    • The interface width of the SCNBS sample was determined to be approximately 2 nm.
    • The lattice misfit between the gamma prime (γ') phase and the gamma (γ) matrix increases with temperature, changing from -0.39% at 20°C to -0.21% at 600°C.
    • The evolution of lattice spacing for both γ' and γ phases at high temperatures was successfully obtained.

    Conclusions:

    • The study successfully applied advanced microscopy techniques to characterize SCNBS at high temperatures.
    • Temperature significantly impacts the lattice misfit and thermal expansion coefficient of SCNBS.
    • The developed methods provide accurate insights into the structural behavior of superalloys under operational conditions.