(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點實驗室，長沙 410083；
3. 中國航空工業(yè)集團(tuán)公司 北京航空材料研究院，北京 100095)
摘 要: 采用金相組織(OM)、掃描電鏡(SEM)、透射電鏡(TEM)以及力學(xué)性能測試研究固溶溫度對7B50鋁合金固溶程度、組織及力學(xué)性能的影響。結(jié)果表明：在460~480 ℃溫度范圍內(nèi)，隨著固溶溫度升高，實驗合金的殘余第二相粒子減少，固溶程度增加，相應(yīng)時效強化效應(yīng)增強，再結(jié)晶程度變化不大；當(dāng)固溶溫度高于480 ℃后，殘余第二相粒子的溶解沒有明顯提高，但再結(jié)晶程度加大，且合金組織發(fā)生過燒，力學(xué)性能明顯惡化；當(dāng)固溶溫度為480 ℃時，實驗合金固溶較充分，再結(jié)晶程度不高，此時合金綜合力學(xué)性能最好，因此，7B50合金的最佳固溶溫度為480 ℃。
關(guān)鍵字: 7B50鋁合金；固溶溫度；組織；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
