Corrosion mechanism of electron beam remelted layer of eutectic high-entropy alloy AlCoCrFeNi2.1

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-02-26 DOI:10.1016/j.matchar.2025.114882

Daochen Feng , Yifei Zheng , Wenjian Zheng , Zhihui Cai , Zhangmin Jin , Yinghe Ma , Sendong Ren , Shiyi Bao , Dapeng Tan , Jianguo Yang

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Abstract

Electron beam remelting technology was used to improve the microstructure of the high-entropy alloy (HEA) AlCoCrFeNi_2.1. The results of electrochemical experiments show that the corrosion resistance of the remelted layer on the sample surface is the best under the process conditions of 6 mA + 400 mm/min (remelting parameters). The surface corrosion morphology of the remelted layer of AlCoCrFeNi_2.1 shows body-centered cubic (BCC/B2) selective corrosion and face-centered cubic (FCC) phase pitting corrosion characteristics. Additionally, Cl⁻ promotes the dissolution of matrix alloy atoms, leading to pitting corrosion nucleation. As the corrosion time increases, the passivation film on the BCC phase surface becomes thinner preferentially. After remelting, the alloy grains are significantly refined, the grain boundary density is increased, and the alloy elements are more evenly distributed, which is the fundamental reason for the improved corrosion resistance.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.