Microstructure Evolution of Al-Zn-Mg-Cu Alloy by Semisolid Compression

In this paper, it shows the microstructure and mechanical properties of 7050 aluminum alloy during semisolid compression at 610-680 & DEG;C for 5-20 min were investigated. The results display that the semisolid near-spherical structure can be obtained during the compression process. It also can be found that Cu is enriched at the grain boundary, while Mg and Zn are depleted at the grain boundary obviously. The increase in the material temperature and dislocation movement during compression will lead to the diffusion of solute, resulting in the growth and overlap of precipitated phases, and affect the performance. Therefore, yield strength decreases at semisolid temperature and increases with increasing temperature.