The study on the magnetic FeCoNiCuAl high-entropy alloy film with excellent corrosion resistance

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2024-11-23 DOI:10.1016/j.vacuum.2024.113859

Bin Li , Yubing Xia , Haonan Li , Mengya Chen , Zhongyuan Wu , Xiaohua Tan , Hui Xu

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Abstract

FeCoNiCuAl high-entropy alloy films (HEAFs) were prepared by direct current magnetron sputtering. The magnetic properties, corrosion resistance in 3.5 wt% NaCl solution and microstructure of the as-deposited and annealed HEAFs were investigated. The results indicated that the as-deposited HEAFs had an amorphous structure. With the increase of annealing temperature, the HEAFs gradually crystallized and the coercivity increased. The as-deposited HEAF had better corrosion resistance than the bulk FeCoNiCuAl high-entropy alloy (HEA), and the I_corr value was 1.41 × 10⁻⁶A/cm². The improved corrosion performance is mainly due to the homogeneity of the composition. After annealing, (Cu, Ni)-rich precipitates appeared in the HEAFs, and the quantity and size of the precipitates increased with increasing annealing temperature. Annealing treatment significantly enhanced the corrosion resistance of the HEAFs. After annealing at 673 K, the optimal I_corr of HEAF was 2.74 × 10⁻⁷ A/cm², which was better than the 304 stainless steel, FeSiB amorphous alloy, some HEAFs, etc. The mechanism of corrosion resistance improvement of the HEAFs after annealing treatment was discussed using scanning electron microscopy and X-ray photoelectron spectroscopy. Good corrosion resistance results from high valence oxides and stable passivation films. This work not only provides direction for the enhancement of corrosion resistance of HEA magnetic films, but also provides candidate materials for magnetic film sensors in harsh environments.

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具有优异耐腐蚀性的磁性 FeCoNiCuAl 高熵合金膜的研究

采用直流磁控溅射法制备了铁钴镍铜铝高熵合金薄膜（HEAFs）。研究了沉积和退火 HEAFs 的磁性能、在 3.5 wt% NaCl 溶液中的耐腐蚀性以及微观结构。结果表明，沉积的 HEAFs 具有非晶态结构。随着退火温度的升高，HEAFs 逐渐结晶，矫顽力增加。与块状铁钴镍铜铝高熵合金（HEA）相比，析出的 HEAF 具有更好的耐腐蚀性，Icorr 值为 1.41 × 10-6A/cm2。腐蚀性能的改善主要归功于成分的均匀性。退火后，HEAF 中出现了富含（铜、镍）的析出物，且析出物的数量和大小随退火温度的升高而增加。退火处理大大提高了 HEAFs 的耐腐蚀性。在 673 K 退火后，HEAF 的最佳 Icorr 为 2.74 × 10-7 A/cm2，优于 304 不锈钢、FeSiB 非晶合金和某些 HEAF 等。利用扫描电子显微镜和 X 射线光电子能谱探讨了退火处理后 HEAFs 耐腐蚀性能提高的机理。良好的耐腐蚀性源于高价氧化物和稳定的钝化膜。这项工作不仅为提高 HEA 磁性薄膜的耐腐蚀性提供了方向，而且为恶劣环境下的磁性薄膜传感器提供了候选材料。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.