Abstract
The effect of Cu content on precipitation hardening, elevated temperature tensile strength and microstructure of an Al–Cu–Mg–Ag alloy was investigated. By increasing Cu content from 4 to 8 wt.%, the tensile strength increased from 434 to 559 MPa at room temperature, and from 141 to 228 MPa at 300°C, with only a slight drop in elongation. The high strength of the 8Cu alloy is attributed to the high density of fine Ω and θ′ precipitates and an additional Cu-containing intermetallic compound. Addition of Cu above its solubility in Al may induce excessive strengthening both at room and high temperatures.
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