The homogenization heat treatment for ingots

solid solution and aging treatment for plate of recycled 7050 aluminum alloy were investigated by optical microscope

direct reading spectrometer

universal testing machine and other experimental methods. The results indicate that the segregation rates of the main elements Cu

Mg

and Zn in the recycled 7050 aluminum alloy remains below 8%

absence of casting defects including cracks and pores in the macrostructure. After homogenization heat treatment of the ingots at 470 ℃ for 20 h

eutectic structure generated under non-equilibrium solidification conditions at the grain boundary diappears. After solution treatment of the plate at 475 ℃ for 0.5 h

the second phases at grain boundary are completely dissolved

where the elongation reaches 34%. Then after aging treatment at 120 ℃ for 24 h

granular precipitates are precipitated dispersedly in the grains

and the mechanical properties of plate present satisfied effect

where the tensile strength

yield strength and elongation reach 608 MPa

539 MPa and 17.5%

respectively.