(1. 国防科技大学 航天与材料工程学院，长沙 410073；
2. 中南大学 材料科学与工程学院，长沙 410083；
3. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要:
关键字: 7039铝合金；热压缩变形；流变应力；Zener¬¬-Hollomon参数；变形激活能
（1. College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China;
2. School of Materials Science Engineering, Central South University, Changsha 410083, China;
3. Key Laboratory of Nonferrous Materials, Ministry of Education, Central South University, Changsha 410083, China）
Abstract:The flow stress features of 7039 aluminum alloy were studied by isothermal compression of cylindrical specimen at 300−500 ℃ and strain rate of 0.01−10 /s with Gleeble−1500 simulated machine. The results show that the flow stress is controlled by strain rate and deformation temperature. The flow stress increases with strain rate increasing and decreases with deformation temperature increasing. The 7039 aluminum alloy shows the phenomenal of dynamic recovery at the strain rates less than 10 /s; the alloy shows the phenomenal of partial dynamic recrystallization at the strain rates higher than 10 /s. The flow stress of 7039 aluminum alloy during high temperature deformation can be represented by Zener¬¬-Hollomon parameter. Four material constants of the alloy during plastic deformation at high temperature are derived from the interdependencies of flow stress, strain rate and temperature.
Key words: 7039 aluminum alloy; hot compression deformation; flow stress; Zener¬¬-Hollomon parameter; thermal deformation activation energy
