In this work, the effects of Ce addition (0, 0.1 wt%, 0.3 wt%, 0.5 wt% and 0.7 wt%) on the evolution of microstructure and mechanical properties of 6111Al alloy and strengthening mechanism of 6111Al–Ce alloy were systematically investigated by a polarizing microscope, a scanning electronic microscope, an energy dispersive spectroscope and a high-resolution transmission electron microscope. The results indicate that with 0.3 wt% Ce addition, the α-Al grains show the equiaxed crystal morphology with the average size decreasing from 137 to 57 μm and numerous small AlCeSi phases with lump-like or plate-like morphology are distributed closely along the grain boundary. The peak yield strength, ultimate tensile strength and elongation of 6111Al–Ce alloy reach to 279 MPa, 316 MPa and 12.1%, respectively, which is attributed to the grain refinement strengthening and the formation of nanosized Al₁₁Ce₃ precipitates. Eventually, this investigation gives us instructive suggestion to prepare the new kind of aluminum alloy with high strength and high ductility.

在这项工作中，系统研究了Ce添加量（0、0.1 wt%、0.3 wt%、0.5 wt%和0.7 wt%）对6111Al合金组织和力学性能演变的影响以及6111Al-Ce合金的强化机制。由偏光显微镜、扫描电子显微镜、能谱仪和高分辨透射电子显微镜组成。结果表明, 添加 0.3 wt% Ce 后, α-Al 晶粒呈现等轴晶形貌, 平均尺寸从 137 μm 减小到 57 μm, 大量块状或片状形态的小 AlCeSi 相沿晶面紧密分布。晶界。6111Al-Ce 合金的峰值屈服强度、极限拉伸强度和伸长率分别达到 279 MPa、316 MPa 和 12.1%，₁₁ Ce ₃沉淀。最终，本研究为我们制备高强度、高延展性的新型铝合金提供了指导性的建议。