Densification, Microstructure and Anisotropic Corrosion Behavior of Al-Mg-Mn-Sc-Er-Zr Alloy Processed by Selective Laser Melting

High-performance additives manufactured by Al alloys provide significant potential for lightweight applications and have attracted much attention nowadays. However, there is no research on Sc, Er Zr microalloyed alloys, especially concerning corrosion behavior. Herein, crack-free dense Al-Mg-Mn-Sc-Er-Zr were processed selective laser melting (SLM). After optimizing the process parameters of SLM, anisotropic behavior sample (volume energy density 127.95 J·mm−3) was investigated intergranular (IGC) electrochemical measurements. The results showed that XY plane as-built less prone to IGC, it also has a higher open circuit value −901.54 mV, polarization resistance 2.999 × 104 Ω·cm2, lower current 2.512 μA·cm−2 as well passive film with superior compared XZ plane. According our findings, because fewer primary phases Al3(Sc, Er, Zr) Al2MgO4, which can induce localized corrosion. Additionally, fraction low-angle grain boundaries (LAGBs) stronger (001) texture index along building direction are associated better