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制备了一种含Er和Zr元素的板材用Al-Mg-Si合金,其化学成分为Al-0.8Mg-1.0Si-0.8Cu-0.2Mn-0.15Zr-0.3Er。通过透射电镜、X射线衍射、扫描电镜、能谱和光学显微镜等分析,研究了合金铸态组织特征,探讨了合金均匀化退火前后析出相的变化。结果表明,添加Er、Zr元素后,铸锭的晶粒多呈等轴晶,第二相主要为Mg2Si、Al1.9CuMg4.1Si3.3、CuAl2、Al4Mn3Si2、初生Al3Er、Al3Zr和β-Si相;均匀化退火后,第二相质点分布均匀,Mg2Si、Al1.9CuMg4.1Si3.3、CuAl2相溶解消失,过饱和固溶Er元素析出,形成与基体共格的Al3Er相粒子,并形成了核壳状Al3(Er,Zr)复合相。
A kind of Al-Mg-Si alloy for plate containing Er and Zr was prepared, whose chemical composition was Al-0.8Mg-1.0Si-0.8Cu-0.2Mn-0.15Zr-0.3Er. The microstructures of as-cast alloys were investigated by transmission electron microscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and optical microscopy. The changes of precipitated phases before and after homogenization annealing were also investigated. The results show that the grains of ingot are mostly equiaxed and the second phases are Mg2Si, Al1.9CuMg4.1Si3.3, CuAl2, Al4Mn3Si2, primary Al3Er, Al3Zr and β-Si phases after addition of Er and Zr. Homogenization annealing, the second phase particles are evenly distributed, Mg2Si, Al1.9CuMg4.1Si3.3, CuAl2 phase dissolution disappears, supersaturated solid solution of Er element precipitation, formed with the matrix Al3Er phase particles and the formation of the core shell Al3 (Er, Zr) composite phase.