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

IF 4.3 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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引用次数: 0

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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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.