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Al_3Zr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Al_7Cu_2Fe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.
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 Al_3Zr dispersoids. When the forgings are treated at 510 ℃, the recrystallization fraction increases significantly to about 48%. The main phases in this alloy are Al_7Cu_2Fe 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.
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