(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 采用Gleeble-1500热模拟实验机研究2519铝合金高温变形组织演化行为。利用光学显微镜(OM)及透射电子显微镜(TEM)分析合金在不同压缩条件下的组织形貌特征。结果表明，2519铝合金在变形温度为300~450 ℃、应变速率为0.01~1 s−1条件下，仅发生动态回复；而在变形温度为350~450 ℃，变形速率为10 s−1的条件下变形时，发生动态再结晶，动态再结晶机制为连续动态再结晶和几何动态再结晶。
关键字: 2519铝合金；热压缩；显微组织；动态再结晶
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract: Microstructure evolution of 2519 alloy during compression at elevated temperatures was investigated by compression on Gleeble 1500 dynamic materials test machine. The microstructures of the alloy were analysed with optical microscope and transmitted electron miroscope. The results show that the alloy only dynamic recovery occurred when the test temperature and strain rate of interest were 300−450 ℃ and 0.01−1 s−1; and the dynamic recrystallization was represented when the test temperature and strain rate of interest were 350−450 ℃ and 10 s−1. The machanisms of dynamic recrystallization were continuous dynamic recrystallization and geometric dynamic recrystallization
Key words: 2519 aluminum alloy; hot compression;microstructure; dynamic recrystallization
