Effect of Al variation on microstructure and properties of porous FeCoNiCrAlx high-entropy alloys synthesized via thermal explosion

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-02-03 DOI:10.1016/j.intermet.2025.108687

Bowen Tang , Zhichao Shang , Weijia Guo , Zixuan Pang , Farid Akhtar , Jianzhong Wang , Baojing Zhang , Shiheng Li , Peizhong Feng

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Abstract

Porous FeCoNiCrAl_x high-entropy alloys (HEAs) with excellent resistance to high-temperature oxidation and corrosion were synthesized by a novel thermal explosion (TE) reaction. This method combines the advantages of FeCoNiCrAl_x HEAs and porous intermetallic compounds as high-temperature filtration materials. The effects of Al atomic fraction on the microstructure and phase composition of FeCoNiCrAl_x HEAs were studied. A comprehensive assessment of the mechanical properties, oxidation resistance, and corrosion resistance of these materials was also evaluated. The results indicate that the main phase structure of HEAs has a transition from FCC to BCC with the increase of Al addition. Meanwhile, the intermetallic compound B2 phase precipitates out of the matrix and significantly enhances the mechanical properties of FeCoNiCrAl_x HEAs. Adding Al improves not only the porosity (32.05 %) and compression performance (σ_max = 219.44 MPa, ε_max = 2.93 %) of porous FeCoNiCrAl_x but also enhances the oxidation resistance of the alloy at 1000 °C and corrosion resistance in 3.5 wt% NaCl solution. The 20 at.% Al sample (Al-20) forms a continuous Al₂O₃ protective film on the skeleton of porous HEAs, and the mass gain is only 3.48 % after 120 h oxidation at 1000 °C. Al-5 promotes the generation of passivation films and improves the stability of passivation films, effectively limiting the electrochemical reaction of the material.

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Al变化对热爆法制备多孔FeCoNiCrAlx高熵合金组织和性能的影响

采用新型热爆反应（TE）合成了具有优异耐高温氧化和耐腐蚀性能的多孔FeCoNiCrAlx高熵合金（HEAs）。该方法结合了FeCoNiCrAlx HEAs和多孔金属间化合物作为高温过滤材料的优点。研究了Al原子分数对FeCoNiCrAlx HEAs微观结构和相组成的影响。对这些材料的机械性能、抗氧化性和耐腐蚀性进行了综合评估。结果表明，随着Al添加量的增加，HEAs的主相结构由FCC向BCC转变。同时，金属间化合物B2相从基体中析出，显著提高了FeCoNiCrAlx HEAs的力学性能。Al的加入不仅提高了多孔FeCoNiCrAlx的孔隙率（32.05%）和压缩性能（σmax = 219.44 MPa, εmax = 2.93%），而且提高了合金在1000℃时的抗氧化性能和在3.5 wt% NaCl溶液中的耐腐蚀性能。20点。% Al样品（Al-20）在多孔HEAs骨架上形成连续的Al2O3保护膜，在1000℃氧化120 h后，质量增益仅为3.48%。Al-5促进了钝化膜的生成，提高了钝化膜的稳定性，有效地限制了材料的电化学反应。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.