Fabrication of Fe-based metallic glass reinforced FeCoNiCrMn high-entropy alloy through additive manufacturing: mechanical property enhancement and corrosion resistance improvement

Abstract

In recent years, high entropy alloys (HEA) receive extensive attention for their excellent mechanical performance. In this paper, the FeCoNiCrMn high-entropy alloy reinforced material is produced by laser powder bed fusion (LPBF). The excellent tensile performance can be achieved through many strengthening mechanisms, e.g., solution strengthening, dislocation strengthening, fine-grain refinement, and dispersion strengthening. The reinforced material with additive Fe-based metallic glass shows a yield strength of 675 MPa, 29.8% higher than FeCoNiCrMn (520 MPa), and an average hardness of 241.9 HV, 12.7% higher than FeCoNiCrMn (214.6 HV). Meanwhile, the plasticity of the reinforced material is maintained at a good level. In comparison with FeCoNiCrMn, the corrosion current density is reduced by 18.9%, and the corrosion resistance is significantly improved. The high strength and corrosion resistance are achieved by the addition of Fe-based metallic glass, which provides a feasible approach for the preparation of HEA with enhanced mechanical properties in the future.

Keywords

• Additive manufacturing
• High-entropy alloy
• Metallic glass
• Strengthening mechanism