(1. 國(guó)防科技大學(xué) 航天與材料工程學(xué)院，長(zhǎng)沙 410073；
2. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
3. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要:
關(guān)鍵字: 7039鋁合金；熱壓縮變形；流變應(yīng)力；Zener¬¬-Hollomon參數(shù)；變形激活能
（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
