Mechanical Properties and Corrosion Resistance of Forged Aa7075 and Aa7005 Alloys

Effects of different forging processes on the mechanical properties and corrosion resistance of AA7005, and AA7075 aluminum alloys were investigated in this study. The AA7005 and AA7075 extruded bars were used to undergo annealing treatment and subject to different forging processes (include different dies, forging temperatures and reduction ratios). Then, the forged samples were removed to carry out solution treatment, water quenched and T73 artificial aging treatment. The target of this study is aiming to investigate the microstructures of forged samples, including second phase particles, dynamic recrystallization, dislocation tangling and grain refinement. In addition, the effect of deformation on microstructure, mechanical properties and corrosion resistance would also be investigated.Due to the climate change and the greenhouse effect on environment, the issue of energy consumption becomes more and more important. Lightweight vehicles help reducing energy consumption, and the use of high-strength aluminum alloys becomes the trend in automobile sector. The high strength 7xxx series aluminum alloys are susceptible to stress corrosion cracking. A T73 heat treatment is usually adopted for decreasing stress corrosion, but over-aging heat treatment reduces the strength of aluminum alloy. Using the forging process could improve the strength and toughness of aluminum alloy. The topics of this study is to assess the strength and corrosion resistance of forged aluminum alloys (cold and hot forgings). The experimental results offer technical data for design and for making high strength forged aluminum alloys for industry.