Abstract
? 2022 Elsevier B.V.The microstructure evolution and its effect on the strength properties and fatigue performance of the Al-Cu-Mg alloy are investigated by using optical microscope (OM), scanning electron microscope (SEM), electron back-scattered diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscope (TEM). Results show that the strength-ductility trade-off can be improved and the fatigue crack propagation (FCP) rate of the Al-Cu-Mg alloy can be reduced by refining Goss-oriented grains. Post-fatigue electron back-scatter diffraction revealed that the strain homogenization can make the interior of fine Goss-oriented grain to occur the tiny deformation, which is not easy to transmit damage to adjacent grains. Therefore, refining Goss-oriented grains not only increases the strength but also improves the ductility and promotes crack deflection, reducing the FCP rate.
NSTL
Elsevier