Effect of Forging Process and Heat Treatment on Microstructure and Mechanical Properties of Er7050 Aluminium Alloy

Abstract:

In order to explore the effect of multi-directional forging on the microstructure and mechanical properties of aluminium alloy, this paper took the homogenized Er7050 aluminum alloy as the research object. The alloy samples were subjected to multi-directional forging of three kinds of forging passes at 400 ℃, namely three-time upsetting and three-time cross stretching (3U3CS), 6U6CS and 9U9CS. Subsequently, the samples were subjected to solid solution treatment, water quenching and T6 aging treatment. The microstructure and mechanical properties of the samples were analyzed. Comparison of the mechanical properties of the samples obtained by the different forging processes reveals that the sample treated by the 9U9CS forging process has the best mechanical properties, which is attributed to its fine grains and dense precipitated strengthening phases. The average tensile strength of the sample under this forging process is 621.4 MPa, the average yield strength is 545.4 MPa, and the average elongation is 13.58%, which indicates that the optimized forging process significantly improves the mechanical properties of the alloy.