This work mainly studies on Sc microalloying in Al-7075 alloys. The microstructure characteristics and mechanical properties of the Sc-contained Al-7075 alloys were investigated after homogenization at 460 ℃ for 10 h. The corrosion behavior of the 7075 alloys after aging was examined using a three-electrode system. The results showed that significant reduction in grain sizes from 129.92 μ m without Sc alloy to 32.17 μ m with 0.6% Sc. The microhardness increased with the increase of Sc content in the alloy from 71.7 ± 1.3 HV without Sc alloy to 89.2 ± 4.7 HV. The tensile strength also increased from 151.82 ± 1.07 MPa to 212.85 ± 7.35 MPa. The results also revealed that the addition of Sc element in 7075 aluminum alloys not only reduced the corrosion current density of the alloy, but also increased the corrosion resistance of the alloy in the corrosive environment.

中文翻译：

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固溶时效处理后的含Sc的Al-7075合金的组织，力学性能和腐蚀行为

这项工作主要研究Al-7075合金中的Sc微合金化。在460℃均质10h后，研究了含Sc的Al-7075合金的组织和力学性能。使用三电极系统检查了7075合金在时效后的腐蚀行为。结果表明，晶粒尺寸从无Sc合金的129.92μm显着减少到具有0.6％Sc的32.17μm。随着Sc含量的增加，显微硬度从无Sc合金的71.7±1.3 HV增加到89.2±4.7 HV。拉伸强度也从151.82±1.07 MPa增加到212.85±7.35 MPa。结果还表明，在7075铝合金中添加Sc元素不仅降低了合金的腐蚀电流密度，