2025/12/05 by Yuan, Zhipeng, Lu, Yifan, Jiang, Yuanlong +8
#FOS: Physical sciences #Physical sciences
paper · doi:10.48612/letters/2025-4-236-248
This study systematically investigates the dual enhancement of mechanical properties and corrosion resistance in multi-layered aluminum sheets achieved through the introduction of an interlayer. The interlayer serves as an effective diffusion barrier during the brazing process, significantly impeding the inward migration of Si atoms from the clad layer into the AA3xxx core. This mitigation of Si diffusion not only preserves the microstructural integrity of the core layer but also reduces the risk of intergranular corrosion. Furthermore, natural aging promotes the precipitation of Guinier−Preston (GP) zones within the core matrix, contributing substantially to yield strength improvement through coherent precipitation hardening. First-principles calculations based on the density functional theory were employed to analyze the relatively stable atomic structure and the bonding mechanism of GP zones. The maximum in work of adhesion (Wad) appears in the Al(010) / MgSi(010) B-C interface. The strength of bond between Al and Si atoms in the Al(010) / MgSi(010) interface is stronger than that in Al(010) / Al2MgSi(001) and Al(010) / Al6MgSi(001) interfaces. Additionally, electronic structure and work function analyses demonstrated that the potential difference between the GP zones and the surrounding Al matrix is minimal, thereby suppressing micro-galvanic corrosion. As a result, the multi-layered aluminum sheets exhibit significant enhancements in both mechanical strength and corrosion resistance.