(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 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: 采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射和室温拉伸研究固溶制度对1933铝合金自由锻件组织和力学性能的影响。结果表明：由于Al3Zr粒子对晶界的钉扎作用，在470 ℃以下固溶时，合金的再结晶程度很低(＜15%)；随着固溶温度升高，再结晶程度逐渐上升；510 ℃固溶时，合金的再结晶程度显著增大(约为48%)；1933铝合金锻件中第二相主要有Al7Cu2Fe相和η相；合金经470 ℃固溶60 min后，η相溶解比较充分，此后随温度升高或时间延长第二相变化不大；合金的最佳固溶制度为470 ℃、60 min，在此条件下合金具有最好的力学性能。
关键字: 1933铝合金；固溶；再结晶；第二相；力学性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effects of solution treatment on microstructures and properties of the aged 1933 aluminum alloy forgings were investigate by optical microscopy (OM), scanning electron microscopy (SEM), transmission electrical microscopy (TEM), X-ray diffractometry and tensile testing. The results show that the recrystallization fraction is very low (＜15%) when the temperature is below 470 ℃ due to the pinning effect on grain boundaries of Al3Zr dispersoids. When the forgings are treated at 510 ℃, the recrystallization fraction increases significantly to about 48%. The main phases in this alloy are Al7Cu2Fe and η phases. The second phases don’t change obviously with increasing temperature and time because the η phase is dissolved almost completely after solution treatment at 470 ℃ for 60 min. The best solution treatment for 1933 alloy forgings is 470 ℃, 60 min, and the alloys under these conditions have the best tensile properties.
Key words: 1933 aluminum alloy; solution treatment; recrystallization; second phases; mechanical properties
