(1. 中南大学 材料科学与工程学院,长沙 410083;
2. 有色金属材料科学与工程教育部重点实验室,长沙 410012)
摘 要: 采用末端淬火实验、剥落腐蚀实验、透射电镜(TEM)和X射线残余应力测量仪等方法研究不同时效处理制度对7050铝合金厚板材料组织、性能及残余应力的影响。结果表明: T74时效状态试样较T6时效状态试样沿整个冷却方向上力学性能更加均匀;T74时效状态试样的剥落腐蚀性能较T6有显著提高,且淬火冷却速度对T74状态影响不大;沿整个淬火冷却方向上T74时效状态试样残余应力水平较T6时效状态试样明显降低。
关键字: 7050铝合金;末端淬火;剥落腐蚀;残余应力
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Changsha 410012, China)
Abstract:The effects of different aging on microstructure, properties and residual stress of 7050 aluminum alloy were investigated by end quenching test, exfoliation corrosion test, transmission electron microscopy (TEM) and residual stress test. The results show that the mechanical properties of the T74 temper are more uniform than that of the T6 temper along the direction of the cooling. Not only the exfoliation corrosive nature of the T74 temper is significantly higher than that of the T6 temper, but also the cooling velocity has little effect on it. Furthermore, the distribution of the residual stress is obviously reduced along the cooling direction.
Key words: 7050 aluminum alloy; end quenching test; exfoliation corrosion; residual stress