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为深入研究含稀土(RE)高硅铝合金的组织特征,将质量分数为0.08%P和质量分数为0.6%RE复合变质Al-20%Si-2%Cu-1%Ni-xMg(x=0.4%,0.8%)高硅铝合金浇入金属模具中成形.通过光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)等测试方法,分析了该合金的相组成.结果表明:合金中生成Mg2Si相、Al-Si-Cu-Ni-RE相、AlCuNi相、AlFeMnSi相等金属间化合物;合金中加入质量分数为0.6%RE能较好地变质共晶Si,但过剩的RE易生成针状的Al-Si-Cu-Ni-RE相,该富RE五元化合物的形态在T6热处理前后变化不明显;T6热处理后合金中粗大的AlCuNi相粒状化,且分布较均匀.
In order to further study the microstructure of rare earth (RE) high-silicon aluminum alloy, the mass fraction of 0.08% P and the mass fraction of 0.6% RE metamorphic Al-20% Si-2% Cu-1% Ni-xMg (x = 0.4%, 0.8%) high silicon aluminum alloy was poured into the metal mold and formed by the OM (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) The results show that Mg2Si phase, Al-Si-Cu-Ni-RE phase, AlCuNi phase and AlFeMnSi are intermetallic compounds. The addition of 0.6% RE to the alloy can degenerate the eutectic Si, but excess RE tends to generate acicular Al-Si-Cu-Ni-RE phase. The morphology of the RE-rich pentavalent compound did not change significantly before and after T6 heat treatment; coarse AlCuNi phase in the alloy was grained after T6 heat treatment, And more evenly distributed.