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利用压铸工艺将液态镁和固态铝液-固复合是镁/铝异种材料连接的新工艺,进行铝合金表面氧化膜去除工艺的研究,并在此基础上,利用自制的液固双金属复合装置将液态镁合金AM60与处理后的固态铝合金A390进行液固复合。研究铝合金表面处理对液态AM60/固态A390液固复合工艺的影响,分析研究复合试样界面的组织和性能。结果表明:采用铝合金表面处理工艺能有效地去除A390铝合金表面的氧化膜,同时在其表面形成一层含La2O3的包覆层。包覆层一方面可保护铝合金表面,避免再次被氧化;另一方面包覆层中的La2O3又可以改善液态AM60/固态A390复合界面的组织,提高界面结合强度。AM60/A390的液固复合界面的抗剪强度最高可达78.4 MPa。经过固溶处理之后,可将强度提高到84 MPa。
The liquid magnesium and the solid aluminum liquid-solid composite are the new process of joining the dissimilar magnesium / aluminum dissimilar materials by the die-casting process, and the research on the process of removing the oxide film on the surface of the aluminum alloy is carried out. On this basis, The liquid magnesium alloy AM60 and the treated solid aluminum alloy A390 liquid-solid composite. The effects of aluminum alloy surface treatment on liquid AM60 / solid A390 liquid-solid composite process were studied, and the microstructure and properties of the composite sample interface were analyzed. The results show that the surface of the A390 aluminum alloy can be effectively removed by the aluminum alloy surface treatment process, and a La2O3-containing coating is formed on the surface of the A390 aluminum alloy. On the one hand, the coating can protect the surface of the aluminum alloy from being oxidized again; on the other hand, La2O3 in the coating can also improve the organization of the liquid AM60 / solid A390 composite interface and improve the bonding strength of the interface. The shear strength of AM60 / A390 liquid-solid composite interface is up to 78.4 MPa. After solution treatment, the strength can be increased to 84 MPa.