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Extra electron reflections in concentrated alloys do not necessitate short-range order

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In many concentrated alloys of current interest, the observation of diffuse superlattice intensities by transmission electron microscopy has been attributed to chemical short-range order. We briefly review these findings and comment on the plausibility of widespread interpretations, noting the absence of expected peaks, conflicts with theoretical predictions, and the possibility of alternative explanations.

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Fig. 1: Electron diffraction of CrCoNi in the \(\lceil \bar{1}12\rceil\) zone axis.
Fig. 2: Schematics of CuPt- and AlNi3-type orderings.
Fig. 3: Diffraction of CuPt-type ordering in the \(\lceil \bar{1}12\rceil\) zone axis.

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Acknowledgements

This work was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC02-05CH11231 as part of the Damage-Tolerance in Structural Materials (KC13) program. Work at the Molecular Foundry was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under the same contract. Resources provided by award no. BES-ERCAP0021088 of the National Energy Research Scientific Computing Center, a US Department of Energy Office of Science User Facility operated under the same contract, were also used. F.W. additionally thanks Q. Yu for insightful conversations.

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Authors and Affiliations

  1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Flynn Walsh, Mingwei Zhang, Robert O. Ritchie, Andrew M. Minor & Mark Asta

  2. Graduate Group in Applied Science & Technology, University of California, Berkeley, CA, USA

    Flynn Walsh

  3. National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Mingwei Zhang & Andrew M. Minor

  4. Department of Materials Science & Engineering, University of California, Berkeley, CA, USA

    Mingwei Zhang, Robert O. Ritchie, Andrew M. Minor & Mark Asta

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  1. Flynn Walsh
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Correspondence to Mark Asta.

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Walsh, F., Zhang, M., Ritchie, R.O. et al. Extra electron reflections in concentrated alloys do not necessitate short-range order. Nat. Mater. 22, 926–929 (2023). https://doi.org/10.1038/s41563-023-01570-9

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