Engineering and Technology

3D printed N-doped CoCrFeNi high entropy alloy with more than doubled corrosion resistance in dilute sulphuric acid

R. Zhou, W. Chen, et al.

Discover how selective laser melting (SLM) has enabled the production of a groundbreaking N-doped CoCrFeNi high-entropy alloy with exceptional corrosion resistance—over twice that of traditional samples. This innovative research, conducted by Rui Zhou, Wenyu Chen, Wanpeng Li, Tzu-Hsiu Chou, Yen-Hsiang Chen, Xiaopeng Liang, Junhua Luan, Yuntian Zhu, J. C. Huang, and Yong Liu, is a game-changer in materials science.

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Abstract

This paper demonstrates that selective laser melting (SLM) can produce a single-phased, N-doped CoCrFeNi high-entropy alloy (HEA) with significantly improved corrosion resistance in acidic environments—more than double that of samples made by hot isostatic pressing (HIP). The SLM process creates a heterogeneous microstructure with 3D dislocation cells that promote Cr outward segregation, forming a thick, protective Cr oxide layer. This enhanced corrosion resistance is achieved without sacrificing mechanical properties.

Publisher

npj Materials Degradation

Published On

Jan 31, 2023

Authors

Rui Zhou, Wenyu Chen, Wanpeng Li, Tzu-Hsiu Chou, Yen-Hsiang Chen, Xiaopeng Liang, Junhua Luan, Yuntian Zhu, J. C. Huang, Yong Liu

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