Influence of equal channel angular pressing on the strength and corrosion properties of FeNiMnCr high-entropy alloy

Objectives. High-entropy alloys (HEAs) represent a novel class of metallic materials known for their exceptional mechanical and corrosion-resistant properties. This study investigates the effects of equal channel angular pressing (ECAP) on the microstructure, tensile strength, and corrosion behavior of an equiatomic FeNiMnCr alloy.

Methods. The alloy was synthesized via arc melting, homogenized, and subjected to up to four ECAP passes at 400°C. Phase composition was analyzed using X-ray diffraction, while microstructural features were examined using scanning electron microscopy and transmission electron microscopy. Mechanical properties were evaluated based on Vickers microhardness and tensile testing, while corrosion resistance was assessed in a 3.5% NaCl solution using potentiodynamic polarization.

Results. The results indicate a significant grain refinement, an increased hardness and strength (by 1013 MPa), and an improved corrosion resistance of the alloy after ECAP processing.

Conclusions. The study demonstrates that ECAP is an effective method for enhancing the performance of FeNiMnCr HEAs. This makes it promising for use in nuclear energy, medicine, and aerospace industry.

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