By adding Sn and Sc alone or in combination, as well as conducting a tensile test at 573 K, the synergistic effect of Sn + Sc on high-temperature strengthening in Al–5Cu heat-resistant alloy was investigated. Transmission electron microscope, elements mapping and first-principle calculations were used to characterise the microstructure evolution of the precipitation particles at various states to uncover the processes for high-temperature strengthening. It has been discovered that adding Sn and Sc, either individually or together, can significantly improve the mechanical properties of Al–Cu alloy at elevated temperatures. Among them, the alloy performance under short-time 573 K exposure can be maximised when Sn and Sc elements are added together.
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