Glass-forming ability, microhardness, corrosion resistance, and dealloying treatment of Mg_60−xCu₄₀Nd _x alloy ribbons

Abstract

The influence of Nd addition on the glass-forming ability (GFA), microhardness, and corrosion resistance of Mg_60−xCu₄₀Nd _x (x = 5, 10, 15, 20, and 25, at%) alloys were investigated by differential scanning calorimetry, Vickers-type hardness tests, and electrochemical methods. The results suggest that the GFA and microhardness of the amorphous alloys increase until the Nd content reaches 20at%. The corrosion potential and corrosion current density obtained from the Tafel curves indicate that the Mg₃₅Cu₄₀Nd₂₅ ternary alloy exhibits the best corrosion resistance among the investigated alloys. Notably, nanoporous copper (NPC) was synthesized through a single-step dealloying of Mg_60−xCu₄₀Nd _x (x = 5, 10, 15, 20, and 25) ternary alloys in 0.04 mol·L⁻¹ H₂SO₄ solution under free corrosion conditions. The influence of dealloying process parameters, such as dealloying time and temperature, on the microstructure of the ribbons was also studied using the surface diffusivity theory. The formation mechanism of dealloyed samples with a multilayered structure was also discussed.

Keywords

amorphous alloys / glass-forming ability / microhardness / corrosion resistance / dealloying

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