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采用光学显微镜、扫描电镜(SEM)、能谱分析(EDS)、硬度和电导率测试等方法,研究了均匀化后不同冷却方式对2219铝合金铸锭组织与性能的影响。结果表明,铸态2219铝合金存在严重晶界偏析,晶界处的共晶组织呈蜂窝状;均匀化后共晶组织减少,沿晶界分布的主要为球状、块状的Al_2Cu相和针状的Al_7Cu_2(Fe,Mn)相;均匀化后直接水冷,晶粒内部基本没有析出物;随着出炉温度降低,晶内第二相含量增加、尺寸粗化,经时效后硬度下降,电导率上升。
The effects of different cooling methods on the microstructure and properties of 2219 aluminum alloy ingot were studied by means of optical microscope, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), hardness and electrical conductivity test. The results show that the as-cast 2219 aluminum alloy has serious grain boundary segregation and the eutectic structure is honeycomb at the grain boundaries. The eutectic structure is reduced after homogenization, and the mainly spherical and massive Al 2 Cu phase and acicular Of Al_7Cu_2 (Fe, Mn) phase. After homogenization, it was directly water-cooled with almost no precipitates inside the grains. With the reduction of the tapping temperature, the content of the second phase increased, the size became coarse, the hardness decreased and the electrical conductivity increased .