Abstract
Developing excellent mechanical properties of Al/steel welding-brazing joint adding alloy elements for vehicle structure lightweight is in immediate need to reveal the effect mechanism of alloy elements on the interfacial metallurgical reaction. Here, the Al/steel welding-brazing joints with different Cu-coating thicknesses were designed to determine the effect rule of Cu on mechanical properties and interfacial microstructure evolution. More importantly, the action mechanism of Cu element on diffusion behavior of interfacial elements was clarified by synchrotron radiation light source and thermodynamic models. The results showed that appropriate Cu could improve the tensile strength of joints. And the Cu could efficiently inhibit the growth of interfacial brittle intermetallic compounds (IMCs) and the Fe diffusion into molten pool. Because the chemical potential of Fe in the molten pool increased with an increasing Cu content, which weakened the driving force of Fe diffusion. Besides, Cu and Al would react with each other to form Al 2 Cu with a lower Gibbs free energy under higher Cu content, which deteriorated the tensile strength of joints. Unambiguously, this work will deepen the understanding of the effect mechanism of Cu on the interfacial metallurgical reaction, which will be beneficial to the development and application of excellent properties of Al/Cu-coating/steel welding joints.
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