Abstract
The microstructure evolution corresponding to the mechanical properties of cast Al-2Li-2Cu-0.5Mg-0.15Sc-0.1Zr-0.1Ti alloy aged at 175 °C was investigated, especially in the identification and variation of the cubic phase. The yield strength and ultimate strength of the peak-aged alloy reach 449 MPa and 502 MPa, respectively. From the transmission electron microscopy characterization, it was found that the precipitates primarily consisted of the cubic phase, T1 (Al2CuLi), S′(Al2CuMg), core–shell particles and δ′(Al3Li) phases. Longer exposure to temperature changed the composition from Al6Cu5Li2 to Al6Cu5Mg2, and these two phases are in competition with the T1 and S′ phases.
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