(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；
3. 中国航空工业集团公司 北京航空材料研究院，北京 100095)
摘 要: 采用金相组织(OM)、扫描电镜(SEM)、透射电镜(TEM)以及力学性能测试研究固溶温度对7B50铝合金固溶程度、组织及力学性能的影响。结果表明：在460~480 ℃温度范围内，随着固溶温度升高，实验合金的残余第二相粒子减少，固溶程度增加，相应时效强化效应增强，再结晶程度变化不大；当固溶温度高于480 ℃后，残余第二相粒子的溶解没有明显提高，但再结晶程度加大，且合金组织发生过烧，力学性能明显恶化；当固溶温度为480 ℃时，实验合金固溶较充分，再结晶程度不高，此时合金综合力学性能最好，因此，7B50合金的最佳固溶温度为480 ℃。
关键字: 7B50铝合金；固溶温度；组织；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;
3. Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Beijing 100095, China）
Abstract:The effect of solution temperature on the solid solubility, microstructure and mechanical properties of 7B50 alloy was studied by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile test. The results show that, with the solution temperature increasing from 460 ℃ to 480 ℃，the amount of residual phases decreases the solid solubility increases, and the recrystallization hardly changes with increasing the solution temperature. The corresponding ageing strengthening effect enhances. With the solution temperature increasing above 480 ℃, the amount of residual phases has almost no change and the recrystallization obviously increases. Alloy burnt obviously decrease the mechanical properties. Complete dissolution of the particles in the 7B50 alloy is obtained after solution treatment at 480 ℃.
Key words: 7B50 alloy; solution temperature; microstructure; properties
