Microstructure and corrosion properties of micro-beam plasma remelted Mg-12Dy-1.1Ni alloy

Abstract

Microstructure and corrosion properties of micro-beam plasma remelted (MPRMed) Mg-12Dy-1.1Ni (wt%) alloy were investigated. The as-cast alloy was mainly composed of α-Mg, lamellar Mg₁₂DyNi phase with a 18R-long period stacking order (LPSO) structure, and Mg₂₄Dy₅ phase. After micro-beam plasma remelting (MPR), the grain size of the as-cast alloy was remarkably refined to 11 µm, and the amounts of 18R-LPSO phase increased from 18.3% to 26.0% and distributed as continuous network. The electrochemical and immersion tests indicated that the MPRMed alloy exhibited a lower mass loss rate 0.31 g/(cm²·d) and corrosion current density (605.3 µA/cm², and ∼38.5% reduction after MPR) than the as-cast alloy in 0.1 mol/L NaCl solution. The improved corrosion resistance of the MPRMed alloy was primarily ascribed to the uniform microstructure, denser corrosion products and continuous distribution of 18R-LPSO phase.

Keywords

Mg-Dy-Ni alloy / micro-beam plasma remelting / microstructure / LPSO phase / corrosion properties

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