Study on Creep Properties of Al-Zn-Mg-Cu Alloys

This article conducts high-temperature creep tests on an Al-6.5Zn-2.3Mg-2.5Cu-0.1Zr-0.2Sc alloy in a solid solution + aging state at 200 °C and 150–180 MPa. Characterization of the microstructure of the specimen after creep test fracture was performed using SEM and TEM. The results indicate that the steady-state creep rate range of the alloy was 10−9 to 10−8 s−1, which was positively correlated with applied stress, while the creep life was negatively correlated with applied stress. Through failure analysis, it was found that the main deformation mechanism of the alloy was the dislocation climbing mechanism. The fracture mode of the alloy was ductile fracture.