B4C对高熵合金薄膜辐照响应和摩擦学行为的影响

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-04-28 DOI:10.1016/j.compositesb.2025.112579

Qingchun Chen , Linxin He , Juan Du , An Li , Tianyu Zhao , Nan Qiu , Yuan Wang

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引用次数: 0

摘要

辐照引起的点缺陷迁移和聚集加剧了传统合金固有的强度-延性权衡，这对极端辐照应用提出了严峻的挑战。为了解决这一问题，本研究创新性地通过磁控共溅射将B4C引入AlCrFeNi高熵合金中，制备了具有短程有序（SRO）结构的高熵复合薄膜（B10, B60）。值得注意的是，在40 keV He离子辐照下，复合薄膜表现出了优异的结构稳定性，而AlCrFeNi晶体在峰值辐照区遭受了严重的晶格损伤。辐照后表征表明，AlCrFeNi的硬度显著增加（ΔH = 4.4 GPa），而复合膜在最小变化下保持了优异的稳定性(B10: 2.6 GPa；B60: 1.7 GPa)。摩擦学结果表明，对于沉积膜，复合膜的磨损率明显低于AlCrFeNi膜。分子动力学（MD）模拟表明，独特的sro主导的微观结构可以实现有效的剪切应变分散，提高地下塑性变形能力。与直觉相反，复合膜的耐磨性表现出辐照诱导的改善，而不是传统润滑膜的退化。特别是在高剂量条件下，B60薄膜的磨损率比AlCrFeNi薄膜低5.1倍。本工作通过调节高熵复合材料的内部微观结构，实现了耐辐照性能和摩擦学性能的协同增强。

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Effect of B4C addition on irradiation response and tribology behaviors of high entropy alloy films

The inherent strength-ductility trade-off in traditional alloys is exacerbated by irradiation-induced point defect migration and aggregation, posing a critical challenge for extreme irradiation applications. To address this limitation, this study innovatively introduced B₄C into AlCrFeNi high entropy alloys via magnetron co-sputtering, fabricating high entropy composite films (B10, B60) with short-range order (SRO) structures. Notably, the composite films exhibited exceptional structural stability under 40 keV He ion irradiation compared to their crystalline AlCrFeNi counterpart, which suffered severe lattice damage in the peak irradiation area. The post-irradiation characterization revealed a substantial hardness increase in AlCrFeNi (ΔH = 4.4 GPa), while composite films maintained superior stability with minimal changes (B10: 2.6 GPa; B60: 1.7 GPa). The tribological results showed that for the as-deposited films, the wear rate of the composite films is significantly lower than that of AlCrFeNi films. Molecular dynamics (MD) simulations unveiled that the unique SRO-dominated microstructure could achieve effective shear strain dispersion and enhance the plastic deformation capacity of subsurface. Counterintuitively, the composite films exhibited irradiation-induced wear resistance improvement in wear resistance instead of the degradation of traditional lubricating films. Especially under the high-dose conditions, the wear rate of the B60 films is 5.1 times lower than that of AlCrFeNi films. This work achieved the synergistic enhancement of irradiation resistance and tribological properties by regulating the internal microstructure of high entropy composite materials.

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.