Effect of Co Content on the Microstructure and Corrosion Behavior of Al0.3CoxCrFeNi High Entropy Alloys

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2023-08-29 DOI:10.1007/s12540-023-01513-8

Zequn Zhang, Qijuan Dong, Zhibin Chen, Junsheng Wu, Jiuyang Xia, Kang Huang, Pengcheng Zuo, Wei Xue, Bowei Zhang

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Abstract

The influence of Co content on the microstructure and corrosion behavior of Al_0.3Co_xCrFeNi (x = 0.25, 0.5 and 1.0) high entropy alloys were investigated. The results indicated that the increased content of Co improve the corrosion resistance of alloy, which can be attributed to the distinction of phase composition in alloys caused by different Co content. The Al_0.3Co_xCrFeNi alloy shows a double-phase (FCC + BCC) structure for x = 0.25 and 0.5, and BCC phase consists of (Al, Ni)-rich B2 phase and (Cr, Fe, Co)-rich A2 phase. The increase of Co content induces the transformations of crystal-structures from BCC to FCC, resulting in the decrease of BCC phase proportion. The Al_0.3CoCrFeNi alloy exhibits the single FCC structure, and all elements tend to be homogeneously distributed. The difference in the potential of FCC and BCC phases indicates the BCC phase acts as anode resulting to localized corrosion, while B2 phase preferentially dissolves compared to the A2 phase due to the lower potential. Therefore, the existence of selective corrosion is found in the alloys with double-phase, by contrast, the alloy with single FCC phase shows random pitting corrosion.

Graphical abstract

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Co含量对Al0.3CoxCrFeNi高熵合金组织及腐蚀行为的影响

研究了 Co 含量对 Al0.3CoxCrFeNi（x = 0.25、0.5 和 1.0）高熵合金微观结构和腐蚀行为的影响。结果表明，增加 Co 的含量可提高合金的耐腐蚀性，这可能是由于不同的 Co 含量导致合金中的相组成发生了变化。Al0.3CoxCrFeNi 合金在 x = 0.25 和 0.5 时呈现双相（FCC + BCC）结构，BCC 相由富含（Al、Ni）的 B2 相和富含（Cr、Fe、Co）的 A2 相组成。Co 含量的增加引起晶体结构从 BCC 向 FCC 转变，导致 BCC 相比例下降。Al0.3CoCrFeNi 合金呈现单一的 FCC 结构，所有元素趋于均匀分布。FCC 相和 BCC 相的电位差表明，BCC 相作为阳极会导致局部腐蚀，而 B2 相由于电位较低，会比 A2 相优先溶解。因此，双相合金存在选择性腐蚀，相比之下，单 FCC 相合金则表现出随机点蚀。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.