Abstract
The mechanical properties are strongly associated with the heat treatment applied in the Al–Cu–Mg alloys. The peak aging treatment is normally employed following solution treatment to achieve a peak aging hardening effect. However, herein, it is shown that the creep resistance is improved at under‐aged (UA) conditions, where the material is transiently weaker than that at peak condition. Under the creep condition of 185 °C and 150 MPa, the creep fracture time of the UA (4 h) alloy is the longest at 146.5 h, followed by 128 h of the peak‐aged alloy and 72 h of the over‐aged alloy. The stress exponents are about 4, which indicates that the creep deformation mechanism of the alloy is mainly due to fracture caused by dislocation slip and grain boundary (GB) migration. Combined with the first‐principles calculation, the reason for the longer creep fracture time of the UA alloy is that the solutes Cu and Mg retained in the UA alloy interact with GBs and dislocations during creep.
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