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[Display omitted] • A novel Al-Cu-Li-Mg-Ag-Sc alloy was fabricated by direct energy deposition. • Dual-phase strengthening of Al 3 Sc and T 1 phases can be achieved with a single-stage T6 heat treatment. • The excellent compressive yield strengths achieved 512, 345 and 227 MPa at 20, 200 and 300 °C, respectively. • Al 3 Sc and T 1 phases can maintain strong pinning effects on dislocations. In this work, precipitation and deformation behavior of a novel Al-Cu-Li-Mg-Ag-Sc alloy fabricated by direct energy deposition (DED) were investigated in detail. Dual-phase strengthening of Al 3 Sc and T 1 (Al 2 CuLi) phases can be achieved with a single-stage T6 heat treatment compared to normal double-aging. The excellent compressive yield strengths achieved 512, 345 and 227 MPa at 20, 200 and 300 °C, respectively. Al 3 Sc and T 1 phases can maintain strong pinning effects on dislocations, suggesting a good work hardening ability during deformation. [ABSTRACT FROM AUTHOR]