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采用金相显微镜(OM)及能谱仪(EDS),研究了A1-0.9Mg-0.9Si-0.6Cu-0.6Mn合金的铸态及其均匀化后的组织,并对合金的铸态组织及均匀化退火过程中相的演化进行了分析。结果表明:合金的铸态组织中存在大量的网状化合物和球状析出物,分别是α-Al+Al(MnFe)3Si2的共晶体和富铜相。均匀化退火过程中,随均匀化退火温度的升高,网状结构α-Al+Al(MnFe)3Si2的共晶体逐渐变成球状细小颗粒Al(MnFe)3Si2相,材料的微观组织得到改善。经560℃×6h退火,均匀化过程基本完成,晶粒未发生明显的粗化。
The as-cast and homogenized microstructures of A1-0.9Mg-0.9Si-0.6Cu-0.6Mn alloy were investigated by optical microscopy (OM) and energy dispersive spectrometer (EDS) The evolution of phases in the homogenization annealing process is analyzed. The results show that there are a large number of reticular and spherical precipitates in the as-cast microstructure of the alloy, which are eutectic and copper-rich phases of α-Al + Al (MnFe) 3Si2, respectively. During the homogenization annealing, the eutectic phase of the α-Al + Al (MnFe) 3Si2 network gradually becomes spherical microstructure of Al (MnFe) 3Si2 with the increase of homogenization annealing temperature. The microstructure of the material is improved. After annealing at 560 ℃ for 6h, the homogenization process was basically completed, and no obvious coarsening of the grains occurred.