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In-Plane Liftout and Push-to-Pull for In Situ Mechanical Testing of Irradiated Inconel X-750

Author

Listed:
  • Lucia R. Gomez-Hurtado

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA
    Department of Nuclear Engineering, North Carolina State University, Raleigh, NC 27695, USA)

  • Tiankai Yao

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA)

  • Fei Teng

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA)

  • Mario D. Matos

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA)

  • Laura Hawkins

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA)

  • Ge Yang

    (Department of Nuclear Engineering, North Carolina State University, Raleigh, NC 27695, USA)

  • Yachun Wang

    (Idaho National Laboratory, Idaho Falls, ID 83415, USA)

Abstract

A streamlined sample preparation method for nanomechanical testing is needed to improve the quality of specimens, reduce the cost, and increase the versatility of specimen fabrication. This work outlines an in-plane liftout focused ion beam (FIB) fabrication procedure to prepare electron-transparent specimens for in situ transmission electron microscopy (TEM) nanomechanical testing. Ion etching and electron backscatter diffraction (EBSD) techniques were used to lift out a [110] oriented grain from a neutron-irradiated bulk X-750 alloy. Careful control of voltages and currents ensured precision. Top surface thinning sweeps prevented resurfacing and redeposition while dog-bone geometries were shaped with a 1:4 gauge width-to-milling pattern diameter ratio. Nanotensile testing in the TEM with a picoindenter allowed for the estimation of an ultimate tensile strength of 2.41 GPa, and inspection revealed a high density of bubbles in the X-750 matrix. The proposed fabrication procedure is significant for preparing samples from radioactive materials, studying complex structures that are orientation-dependent, and analyzing desired planar areas.

Suggested Citation

  • Lucia R. Gomez-Hurtado & Tiankai Yao & Fei Teng & Mario D. Matos & Laura Hawkins & Ge Yang & Yachun Wang, 2024. "In-Plane Liftout and Push-to-Pull for In Situ Mechanical Testing of Irradiated Inconel X-750," Energies, MDPI, vol. 17(17), pages 1-13, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4199-:d:1462109
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