Optimization of Homogenization Heat Treatment Process and Microstructure Evolution of As-cast 2A14 Alloy

The effects of different homogenization heat treatment processes on the microstructure of as-cast 2A14 aluminum alloy were studied, and the homogenization heat treatment processes were optimized. The results show that there are a lot of non-equilibrium solidified eutectic in as-cast 2A14 aluminum alloy, among them, the low melting point non-equilibrium eutectic phase is Al₂Cu phase.The DSC curve of as-cast 2A14 aluminum alloy shows only one endothermic peak, the endothermic peak starting temperature is 510.4 ℃and its peak temperature is 514.4 ℃.The Al₂Cu phase in the alloy dissolves in large quantities with the increase of homogenization heat treatment temperature, which makes the content of Cu in solid solution increase obviously and the content of Cu reaches the maximum value at 510 ℃.Finally, the best homogenizing heat treatment process of as-cast 2A14 aluminum alloy is 486 ℃/24 h+510 ℃/48 h.