(1 哈尔滨工业大学材料科学与工程学院，哈尔滨 150001；
2 韩国机械材料研究院，昌原 641-010，韩国)
摘 要: 采用光学显微镜，扫描电子显微镜，透射电子显微镜，电子探针X射线微区分析仪和定量图像分析仪研究了3 004铝合金铸态和均匀化退火态的显微组织以及均匀化退火温度和时间对显微组织的影响。在铸态组织中发现了一种新的富MgSiCu的共晶体。在均匀化退火过程中发生β→α相变和α弥散相的脱溶析出。在试验条件下，最佳均匀化退火工艺为615℃，20 h。经此工艺处理可获得较均匀的显微组织。
关键字: Al-Mn-Mg合金；均匀化退火；显微组织
（1. College of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，P. R. China
2. Korea Institute of Machinery and Materials，Changwon 641-010，Korea）
Abstract: The microstructure of 3004 alloy in as-cast and homogenized states and the effect of heating temperature and soaking time on the microstructure were studied by OM, SEM, TEM, EPMA and quantitative image analyzer. A new MgSiCu-rich eutectic in the as-cast ingot has been found. During homogenization the transformation of β→α and the precipitation of α dispersoids took place. The best homogenization process is 615 ℃，20 h by which the more uniform microstructure can be obtained.
Key words: Al-Mn-Mg alloys; homogenizing annealing; microstructure
