Enhanced corrosion resistance of Kirkendall-effect-induced hollow Fep-reinforced Cu-matrix immiscible alloys by laser powder deposition

Abstract

Abstract The hollow Fep-reinforced Cu-matrix homogeneous immiscible alloys were successfully produced by the combination of Kirkendall effect and laser powder deposition. The microstructure and corrosion resistance depended not only on chemical composition, but also on cooling rate. When Fe content decreased from 30% to 12% and cooling rate decreased from ∼2\u202f×\u202f104 to ∼1\u202f×\u202f104 K/s, the demixing was eliminated, the mixed Fep (α-Fe/γ-Fe) were uniformly embedded within e-Cu matrix and the single-void Fep transformed into the multi-voids Fep. The multi-voids immiscible alloy exhibited higher corrosion resistance than the single-void immiscible alloy and Brass after immersing for 5 days.