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采用普通半连续铸造技术(DCC)制备了Al-Zn-Mg-Cu-Zr和Al-Zn-Mg-Cu-Zr-0.5Er合金,研究了微量元素Er对Al-Zn-Mg-Cu-Zr合金铸态和均匀化态组织的影响。结果表明:添加0.5%Er后,合金的晶粒尺寸增大且为粗大的树枝晶。在合金凝固过程中,大部分元素Er在晶界处形成三元合金相Al8Cu4Er。经过均匀化处理后,两种合金晶界处的MgZn2相几乎全部回溶。但是在含Er合金中,由于Al8Cu4Er相的回溶温度约为575℃,所以均匀化处理不能有效地消除Al8Cu4Er相。
The Al-Zn-Mg-Cu-Zr and Al-Zn-Mg-Cu-Zr-0.5Er alloys were prepared by conventional semi- continuous casting technology (DCC) Effect of alloy as-cast and homogenized microstructure. The results show that the addition of 0.5% Er increases the grain size of the alloy and is a coarse dendrite. During the solidification of the alloy, most of the elements Er form the ternary alloy phase Al8Cu4Er at the grain boundaries. After homogenization treatment, the MgZn2 phases at the grain boundaries of both alloys are almost completely dissolved. However, in the Er-containing alloys, the homogenization treatment can not effectively eliminate the Al8Cu4Er phase because the Al8Cu4Er phase is about 575C in solution.