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Article Abstract
This paper investigates the effect of adding 0.1 % Y and 0.1 % Zr microalloying on the microstructure and corrosion resistance behavior of Al-5.5Mg-0.3Mn alloys sensitization treatment. The results show that the composite addition of Y and Zr could refine the grain structure and reduce the segregation of the Mg elements during casting. Some micro-scale AlMgYZr phases could also be found in the interior region of grains. After sensitization treatment, nano-sized Al(Y, Zr) particles induce a high proportion of low-angle grain boundaries (LAGBs) in the alloy, and the AlMgYZr phase suppresses the precipitation and coarsening of β phase (AlMg) at the grain boundaries (GBs). The refinement of the β phase reduces the micro-coupling corrosion effect at GBs and improves the intergranular corrosion (IGC) resistance of the alloy. The electrochemical self-corrosion voltage of the alloy is increased, and the self-corrosion current is decreased.
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| http://dx.doi.org/10.1016/j.micron.2025.103789 | DOI Listing |
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