MICROSTRUCTURE AND MECHANICAL BEHAVIOUR OF Al-Li-Zr AND Al-Li-Cu-Mg-Zr ALLOYS
Al-Li-Zr和Al-Li-Cu-Mg-Zr合金的显微组织和力学性能

The aging response, tensile and impact properties of two kinds of Al- Li based alloys have been studied. The microstructure, deformation as well as frac- ture behaviour have been observed by SEM and TEM. It has been found that the mechanism of deformation and fracture for different heat-treated alloys with the same chemical composition is quite different. The cause led to the drop of ductili- ty, toughness as well as anisotropy in peak-aged alloys have been analysed. Finally, possible methods to improve the ductility and toughness of the alloys have been discussed.