Mechanical Properties of Extrusions of Spray Formed 7055 Al Alloy

The effect of indirect extrusion process and T76 heat treatment on microstructure evolution and mechanical properties of the spray formed 7055 alloy was investigated by means of optical microscopy, SEM, EDS and XRD as well as mechanical testing. The results show that the as-sprayed billet has an equiaxed and homogeneous structure with grain sizes of 20- 40μm and without macro- segregation. After indirect extrusion and T76 heat treatment, the billets were fully densified with a certain amount of recrystallized grains. The ultimate tensile strength of the alloy after T76 heat treatment reaches680 MPa with 10% elongation.