On the corrosion of a nano-oxide dispersion strengthened CoCrNi medium entropy alloy prepared by laser powder bed fusion

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-20 DOI:10.1016/j.corsci.2025.113341

Mingyang Li , Yao Qiu , Nick Birbilis , Adam Taylor , Ross K.W. Marceau , Cunshuai Zhang , Yu Yan , Jing Liu

引用次数: 0

Abstract

This study demonstrated a significant strengthening of a ductile CoCrNi medium entropy alloy prepared via laser powder bed fusion using gas-atomised powder with an oxygen content of 0.087 wt%. The alloy’s microstructure, characterised by SEM, scanning TEM, and atom probe tomography, revealed a high density (621.5 N/µm³) of nanoscale non-stoichiometric Cr oxides (∼25 nm) within the alloy. These oxides contributed > 230 MPa to the alloy’s yield strength of ∼776 MPa, providing balanced strength and ductility. The CoCrNi was examined in NaCl and H₂SO₄ electrolytes – exhibiting high corrosion resistance associated with a protective passive film –characterised and discussed herein.

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激光粉末床熔合法制备纳米氧化物弥散强化CoCrNi介质熵合金的腐蚀研究

本研究表明，采用氧含量为0.087 wt%的雾化粉末，通过激光粉末床熔合法制备的韧性CoCrNi中熵合金具有显著的强化效果。通过扫描电镜、扫描电镜和原子探针层析成像对合金的微观结构进行了表征，发现合金内部存在高密度（621.5 N/µm3）的纳米级非化学计量Cr氧化物（~ 25 nm）。这些氧化物对合金的屈服强度（~ 776 MPa）贡献了>； 230 MPa，提供了平衡的强度和延展性。CoCrNi在NaCl和H2SO4电解质中进行了测试，显示出与保护钝化膜相关的高耐腐蚀性，本文对此进行了描述和讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.