The effects of different heating-aging process at initial temperature of 100 ℃ on hardness

conductivity

room temperature tensile properties and microstructure of 7050 aluminum alloy were investigated. The results indicate that the average size and size range of precipitates are increased continuously with the increase of the final aging temperature at the heating rate of 20 ℃/h

which is larger than that at 40 ℃/h when the final aging temperature is 200 ℃. The hardness and room temperature tensile properties of the 7050 aluminum alloy are firstly increased and then decreased with the increase of precipitate size

and the fracture is characterized by mixture of intergranular and transgranular fracture. Meanwhile the conductivity is increased with the heating-aging process. The 7050 aluminum alloy with excellent strength and corrosion resistance can be obtained by adjusting the heating rate and final aging temperature

which requires short aging time.