Abstract
The microstructures and mechanical properties of cast and extruded Al-4Cu-1Li-0.4Mg-0.1Zr-xZn alloys were investigated and the amount of Zn additions was up to 1.1 wt%. The results showed that Zn addition could bring additional MgZn2 phases at the grain boundary and slightly refine the grain size in the as-cast alloy. The mechanical properties of extruded Al-4Cu-1Li-0.4Mg-0.1Zr-xZn alloy increased gradually with the Zn content under different conditions. The yield strength (YS) and ultimate tensile strength (UTS) of T8 treated (stretched by 4% and aged at 150 °C for 32 h) 1.1 Zn alloy could reach 639 MPa and 666 MPa, while elongation (EL) remained at 10.9%. For alloys peak-aged at 175 °C for 32 h (T6 treated), Zn could effectively promote the precipitation of T1 phases (Al2CuLi) but decrease the volume fraction of θ′ phases (Al2Cu) in the matrix. The coarsening of T1 phases could be obviously suppressed by the addition of Zn under overaged condition. However, the precipitate of T1 phases promoted by Zn under the T8 condition is not as obvious as the T6 condition.
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