中间退火工艺对6111铝合金板材微观组织的影响研究

Effect of Intermediate Annealing Process on Microstructure of 6111 Aluminum Alloy Sheet

摘要: 采用光学显微分析、扫描电子显微镜观察、电子背散射衍射分析、差示扫描量热分析、拉伸试验等方式对不同中间退火工艺的6111铝合金板材的显微组织、织构及力学性能进行了研究。结果表明，退火后热轧板材的第二相有α-AlFeMnSi、Mg₂Si、Q及Si相；随着退火温度的升高，第二相的数量呈先增加后减少的趋势。中间退火温度对固溶后板材的织构体积分数影响较大，而退火前轧制变形量对固溶后板材的织构密度影响较大。低温下退火时，退火前轧制变形量的增加会显著增强固溶后的Cube和旋转立方织构；提高中间退火温度使得固溶后的再结晶织构分布随机化。

Abstract: The microstructure, texture and mechanical properties of 6111 aluminum alloy plates with different intermediate annealing processes were investigated by means of optical microscopy analysis, scanning electron microscopy observation, electron backscatter diffraction analysis, differential scanning calorimetry analysis and tensile test. The results show that the second phases of the hot-rolled sheet after annealing include α-AlFeMnSi, Mg₂Si, Q and Si phases. With the increase of annealing temperature, the quantity of the second phase shows a trend of first increasing and then decreasing. The intermediate annealing temperature has a significant impact on the texture volume fraction of the sheet after solution treatment, while the rolling deformation before annealing has a greater influence on the texture density of the sheet after solution treatment. When annealing at low temperatures, the increase in the rolling deformation before annealing will significantly enhance the Cube and rotational cube textures after solution treatment. Increasing the intermediate annealing temperature randomizes the recrystallized texture distribution after solution treatment.