Nanoscale mapping of residual stresses in Al 2024 alloys using correlative and multimodal scanning transmission electron microscopy

Mohamed E. Daoud, Inas Taha, Mohamed Helal, H. Kamoutsi, G. N. Haidemenopoulos, Kamran A. Khan, Dalaver H. Anjum

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A methodology for the mapping of residual stresses in metal alloys has been developed by analyzing an isotropic and homogeneous Al2024 alloy with scanning transmission electron microscopy (STEM), combined with diffraction (4DSTEM) and electron energy loss spectroscopy (STEM-EELS) techniques of TEM. The investigations on the alloy's microstructure and elemental distributions were also carried out with conventional dark-field STEM (DFSTEM) and X-ray energy dispersive (EDS) techniques, respectively. Using the STEM-EELS technique, the Young's modulus (YM) is mapped in the (001) plane of the Al alloy in the same regions where the residual strain maps are generated in [1‾ 00] and [010] directions by using 4DSTEM technique. The YM vs. residual strain plot for the Al 2024 alloy revealed that the value of YM decreased by about ∼ 7 % after the tensile residual strain reached 0.02 %. Whereas such a decrease in YM happens after the compressively residual strain reaches −0.015 %. The residual stress maps were also obtained in accordance with the Hooke's law i.e., by multiplying YM map with the corresponding residual strain maps.

    Original languageBritish English
    Article numbere30280
    JournalHeliyon
    Volume10
    Issue number9
    DOIs
    StatePublished - 15 May 2024

    Keywords

    • Al 2024 alloy
    • Electron energy loss spectroscopy (EELS)
    • Four-dimensional transmission electron microscopy (4D STEM)
    • Residual stresses
    • Scanning transmission electron microscopy (STEM)
    • Young's modulus

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