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Structural materials

Heat-resistant aluminium alloys

Nature Materials volume 22, pages 425–426 (2023)Cite this article

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Scandium added to Al–Cu–Mg–Ag alloys leads to an in situ phase transformation of coherent Cu-rich nanoprecipitates at elevated temperature, with Sc atoms diffusing and occupying their interstitial sites. The transformed nanoprecipitates have enhanced thermal stability while maintaining a large volume fraction and these two microstructural features enable high tensile strength of the Al alloy with creep resistance up to 400 °C.

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Fig. 1: Ledge-assisted in situ phase transformation assembles slow-diffusing Sc solutes into Cu-rich coherent Ω-nanoprecipitates to form high-density, thermally stable V-phase nanoprecipitates.

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Authors and Affiliations

  1. Alloy Behavior and Design Group, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    Amit Shyam & Sumit Bahl

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  1. Amit Shyam
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  2. Sumit Bahl
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Correspondence to Amit Shyam.

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The authors declare no competing interests.

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Shyam, A., Bahl, S. Heat-resistant aluminium alloys. Nat. Mater. 22, 425–426 (2023). https://doi.org/10.1038/s41563-022-01436-6

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