To improve the Al/Mg bimetallic interface, La was added into the Al/Mg bimetallic interface manufactured by a compound casting process. The effect of La addition on the microstructure, mechanical properties and fracture behavior of the Al/Mg bimetallic interface and the formation mechanism of the interface were studied in detail. Al₁₁La₃, Al₈Mn₄La, Al₂₀Ti₂La, and other rare earth precipitates (RE precipitates) preferentially precipitated at the interface with La addition, while the number of the Al₁₁La₃ and Al₈Mn₄La located in eutectic structure area (E area) gradually increased and aggregated in the interface with the increase of the La content. Besides, the matrix structure in different areas of the Al/Mg interface changed in different degrees, and the eutectic structure and primary γ (Mg₁₇Al₁₂) dendrites in the E area were refined, but the intermetallic compounds area (IMC area) had no obvious change. With the addition of the La, the interface was strengthened under the comprehensive effect of refinement strengthening and precipitation strengthening from the E area. When the La content increased to 1.0%, the shear strength of the Al/Mg bimetal reached the maximum of 51.54 MPa, which was 30.95% higher than the group without La addition. However, with the further increase of the La content, the large area aggregation of the Al₁₁La₃ and Al₈Mn₄La occurred in the interface, leading to the separation of the matrix structure of the E area and the decrease of the shear strength of the Al/Mg interface.

为了改善Al/Mg双金属界面，在复合铸造工艺制造的Al/Mg双金属界面中加入La。详细研究了La添加量对Al/Mg双金属界面组织、力学性能和断裂行为的影响以及界面形成机制。Al ₁₁ La ₃、Al ₈ Mn ₄ La、Al ₂₀ Ti ₂ La 等稀土析出物（RE 析出物）优先在界面处析出，而 Al ₁₁ La ₃和 Al ₈ Mn ₄ La位于共晶结构区（Earea）随着La含量的增加而逐渐增加并在界面处聚集。此外，Al/Mg界面不同区域的基体组织发生不同程度的变化，E区共晶组织和初生γ（Mg ₁₇ Al ₁₂）枝晶细化，而金属间化合物区（IMC区）没有明显的变化。随着La的加入，界面在E的细化强化和沉淀强化的综合作用下得到强化。区域。当La含量增加到1.0%时，Al/Mg双金属的剪切强度达到最大值51.54 MPa，比未添加La的组高30.95%。但随着La含量的进一步增加，Al ₁₁ La ₃和Al ₈ Mn ₄ La在界面发生大面积聚集，导致E区基体结构分离，剪切力降低。 Al/Mg 界面的强度。