Superior corrosion-resistant nanostructured hypoeutectic CrCoNi-based medium-entropy alloy processed by laser surface remelting
Source abstract
Abstract
In this work, a ∼400 µm-thick hardened and corrosion-resistant surface layer was fabricated upon the (CrCoNi) 92Si 4B 4 medium-entropy alloy using laser surface remelting technique. Detailed microstructure observations unveil that dual-phase equiaxed grains with major FCC and minor BCT Cr 2B phases in the recrystallized (CrCoNi) 92Si 4B 4 alloy are reconstructed into laser-remelted hypoeutectic nanostructured surface consisting of primary FCC phase and nanostructured FCC/BCT eutectic network. Such hypoeutectic nanostructured surface shows superior corrosion resistance, as evidenced by higher corrosion potential and lower corrosion current density than the as-cast and fully recrystallized counterparts. Galvanic corrosion prevails in all samples, while the laser-remelted surface exhibits ∼ 5 times higher resistance due to the impedance of the nanoscale eutectic network architected in hypoeutectic nanostructure.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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