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采用光学金相显微镜、扫描电镜、能谱仪、X射线物相分析仪和透射电镜等研究了Al-10Zn-1.77Mg-1.0Cu-0.13Zr铝合金的微观组织演变和力学性能。结果表明:合金铸态组织为枝晶结构,主要存在α(Al)和η相(Mg Zn2)。双级均匀化处理后,铸态枝晶组织完全消除,非平衡共晶组织几乎完全回溶进基体。时效处理后,晶内析出相为针状η′相和球状GP区,晶界沉淀相η相沿晶界断续分布,晶界无析出区宽约23nm。基体沉淀相、晶界沉淀相以及晶界无析出区的良好匹配,使Al-10Zn-1.77Mg-1.0Cu-0.13Zr合金不仅具有超高的抗拉强度,同时还拥有良好的塑性。
The microstructure evolution and mechanical properties of Al-10Zn-1.77Mg-1.0Cu-0.13Zr aluminum alloy were investigated by optical microscope, scanning electron microscopy, energy dispersive spectroscopy, X-ray phase analyzer and transmission electron microscope. The results show that the as - cast alloy has a dendritic structure with α (Al) and η (Mg Zn2) phases. After the two-stage homogenization treatment, the as-cast dendritic structure is completely eliminated, and the non-equilibrium eutectic structure almost completely dissolves back into the matrix. After aging treatment, the intragranular precipitation phase is needle-like η ’phase and spherical GP zone. The η phase of the grain boundary precipitates is intermittently distributed along the grain boundaries, and the grain boundary free precipitation region is about 23 nm in width. Al-10Zn-1.77Mg-1.0Cu-0.13Zr alloy not only has super high tensile strength, but also has good ductility.