Study On Hot Deformation Structure And Property For Mid-strength Weldable Al-Li Alloy

The relationship of true stress and true strain for the mid-strength weldable 1420 Aluminum-Lithium alloy has been investigated in this thesis by high temperature compression testing and high temperature tensile testing on different hot deformation conditions. The interdependence of flow stress,strain rate,strain and deformation temperature for the alloy at high temperature has been studied. The constitutive equations were gained by regression analysis and some material constants were derived from that With the aid of OM,X-ray,SEM and TEM,the deformation structure of the mid-strength weldable 1420Aluminum-Lithium alloy on different hot deformation conditions was studied and the soften mechanism was discussed. At the same time,the fracture behavior has been studied as an important part. The fracture mechanism of 1420 Aluminum-Lithium alloy was confirmed.