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Title:: Study on the Abnormal Grain Growth Behavior in Al-Mg-Si-Cu Alloy Extrusion Profile

作者:: 龐新義; 汪文進; 杜東海; 1. 西北工業大學太倉長三角研究院清潔能源研究院，江蘇太倉 215400 2. 明達鋁業科技（太倉）有限公司，江蘇太倉 215400

Author(s):: PANG Xin-yi; WANG Wen-Jin; DU Dong-hai; 1. Clean Energy Research Center, Yangtze River Delta Research Institute,Northwestern Polytechnical University,Taicang 215400, China 2. Minta Aluminum Co., Ltd., Taicang 215400, China

Keywords:: Al-Mg-Si-Cu alloy; extrusion process; abnormal grain growth; solid solution strengthening; tensile property

摘要:: 擠壓型材晶粒的異常長大是限制鋁合金力學性能提高的重要原因之一，揭示擠壓型材晶粒異常長大的機理及對其力學性能的影響，對調控擠壓參數、提高合金力學性能有重要意義。通過研究擠壓溫度、擠壓速度對Al-Mg-Si-Cu合金組織和性能的影響發現，晶粒的異常長大與合金表層晶粒較大的剪切變形以及心部<100>//ED優先生長晶粒與周圍變形晶粒之間較大的取向差和應變梯度促進了合金再結晶過程有關。因固溶強化效應，合金拉伸性能隨擠壓溫度、擠壓速度的升高而提升。擠壓型材出口溫度高于550 ℃時，合金的拉伸性能更加優異。

Abstract:: The abnormal growth of grain in extruded aluminum profiles is one significant factor that affects the improvement of the mechanical properties of the alloy.Understanding the mechanism behind the abnormal growth of grain in extruded aluminum profiles and its effect on mechanical properties is crucial for controlling extrusion parameters and enhancing the properties of the aluminum alloy. In this paper, the effects of extrusion temperature and extrusion rate on the microstructure and properties of Al-Mg-Si-Cu alloys were investigated. The results show that the abnormal grain growth is due to the large shear deformation of the surface grain layer during the extrusion process and strain gradient and misorientation between the <100>//ED preferentially growing grains in core and the surrounding deformed grains, which promotes the recrystallization process of the alloy. According to the solid solution strengthening effect, the tensile properties of alloy are improved with the increase in the extrusion temperature and speed. Moreover, the tensile properties of the alloy are exceptionally good when the outlet temperature of the extruded profile exceeds 550 ℃.