Effect of the Homogenization Annealing Process on the Microstructure and Properties of 5A83 Aluminum Alloy Ingot

Author of the article:YANG Long, DAI Min, CHE Yun, MEN Sanquan , LI Xiang

Author's Workplace：Guizhou Huake Aluminum Materials Engineering Research Co. Ltd., Guiyang 550014, China

Key Words：5A83 aluminum alloy; industrial production; homogenization annealing process; microstructure and properties

Abstract：The homogenization annealing process of 5A83 aluminum alloy was studied to explore the effects of different temperature conditions on its structure and properties. Under the condition of an annealing time of 15 h, the microstructure evolution at different annealing temperatures of 350, 400, 440, 470, 485 and 540 ℃ was observed and the grain size and hardness were measured. The results show that the interaction between the β phase and Mn phase is characterized as follows: when the annealing temperature is lower than 400 ℃ , dissolution of the β phase and precipitation of the supersaturated Mn phase occur simultaneously, and the coarsening effect of the latter on the grain size conceals the refining effect of the former on the grain size. When the annealing temperature is above 440 ℃, the redissolution of the Mn phase plays a leading role in grain refinement. A reasonable explanation is given for the abnormal state (the matrix hardness decreases first and then increases with increasing homogenizing annealing temperature), and 485 ℃ is the most ideal annealing temperature.