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In this work, the precipitationPrecipitation behaviour of Al-Cu-Li alloys with and without Sc and Zr during ageing at 160 °C has been investigated. Scanning transmission electron microscopyElectron microscopy (STEM) was used to characterise the formation of precipitatesPrecipitate during the ageing treatment. The STEM results show that \(\theta^{\prime}\) (Al2Cu) precipitatesPrecipitate form at the early stage of ageing in both alloys, with T1 (Al2CuLi) precipitatesPrecipitate forming gradually with ageing time. In the alloy with Sc and Zr, the \(\theta^{\prime}\) and T1 precipitatesPrecipitate are finer and denser. High-resolution TEM reveals that this is attributed to the formation of Al3(Sc, Zr) dispersoidsDispersoids in the Sc and Zr containing alloy. These Al3(Sc, Zr) dispersoidsDispersoids act as heterogeneous nucleation sites for the precipitationPrecipitation of \(\theta^{\prime}\) and T1. The strengthening contributions from Al3(Sc, Zr) dispersoidsDispersoids, \(\theta^{\prime}\) andScandium T1 are discussed.

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Precipitation Behaviour in Al-Cu-Li Alloys Containing Sc and Zr

  • 会议论文

  • 发表日期：

    2025年

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  • Lu Jiang,
  • Katrin Mester,
  • Timothy Langan,
  • Matthew Barnett,
  • Thomas Dorin

摘要

In this work, the precipitationPrecipitation behaviour of Al-Cu-Li alloys with and without Sc and Zr during ageing at 160 °C has been investigated. Scanning transmission electron microscopyElectron microscopy (STEM) was used to characterise the formation of precipitatesPrecipitate during the ageing treatment. The STEM results show that \(\theta^{\prime}\) (Al2Cu) precipitatesPrecipitate form at the early stage of ageing in both alloys, with T1 (Al2CuLi) precipitatesPrecipitate forming gradually with ageing time. In the alloy with Sc and Zr, the \(\theta^{\prime}\) and T1 precipitatesPrecipitate are finer and denser. High-resolution TEM reveals that this is attributed to the formation of Al3(Sc, Zr) dispersoidsDispersoids in the Sc and Zr containing alloy. These Al3(Sc, Zr) dispersoidsDispersoids act as heterogeneous nucleation sites for the precipitationPrecipitation of \(\theta^{\prime}\) and T1. The strengthening contributions from Al3(Sc, Zr) dispersoidsDispersoids, \(\theta^{\prime}\) andScandium T1 are discussed.