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采用金相显微镜、差示扫描量热仪、扫描电镜及其能谱仪研究了Al-5.4Zn-2.0Mg-0.3Mn-0.25Cu-0.1Zr和Al-5.4Zn-2.0Mg-0.3Mn-0.35Cu-0.1Zr-0.25Sc两种合金的铸态及均匀化态显微组织演变与成分分布。结果表明:铸态组织以典型的枝晶结构存在,由过饱和的α-Al固溶体和α-Al+η-MgZn2的非平衡共晶相组成;铸态合金在470℃保温24 h,非平衡共晶相消失,合金枝晶偏析消除。确定合金铸锭的理想均匀化工艺参数为470℃×24 h。
Al-5.4Zn-2.0Mg-0.3Mn-0.25Cu-0.1Zr and Al-5.4Zn-2.0Mg-0.3Mn-0.35 were investigated by optical microscope, differential scanning calorimetry, scanning electron microscopy and energy dispersive spectroscopy Microstructure Evolution and Composition Distribution of As-Cast and Uniformized Cu-0.1Zr-0.25Sc Two Alloys. The results show that the as-cast microstructure exists as a typical dendritic structure and consists of supersaturated α-Al solid solution and α-Al + η-MgZn2 non-equilibrium eutectic phase. The as-cast alloy is incubated at 470 ℃ for 24 h. Eutectic phase disappears, alloy dendrite segregation eliminated. The ideal homogenization process parameters for determining the alloy ingot are 470 ℃ × 24 h.