Unlocking wear resistance in an ultrastrong dual-phase high-entropy alloy by interface-constrained deformation of brittle Laves phases

IF 6.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Friction Pub Date : 2024-07-05 DOI:10.1007/s40544-024-0884-5

Fei Liang, Yixing Sun, Hongyuan Wan, Yong Li, Wenhao Lu, Ao Meng, Lei Gu, Zhaoping Luo, Yan Lin, Yaping Zhang, Xiang Chen

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Abstract

The pronounced brittleness of hard Laves phase intermetallics is detrimental to their tribological properties at room temperature. In this study, we utilized a heterogeneous structure to engineer an ultrastrong dual-phase (Laves + B2) AlCoFeNiNb high-entropy alloy that exhibits a low wear rate (3.82×10⁻⁶ mm³/(N·m)) at room temperature. This wear resistance in the ball-on-disc sliding friction test with the counterpart of Al₂O₃ balls stems from the activated deformation ability in the ultrafine Laves lamellae under heterogeneous interface constraints. Furthermore, as tribological stress intensifies, the surface deformation mechanism transitions from dislocation slip on the basal and pyramidal planes to a unique combination of local shear and grain rotation within the Laves phase. Our study illuminates fresh perspectives for mitigating the embrittling effect of Laves phase intermetallics under tribological loading and for the development of wear-resistant materials.

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通过脆性拉维斯相的界面约束变形，揭示超强双相高熵合金的耐磨性

硬拉氏相金属间化合物的明显脆性不利于它们在室温下的摩擦学特性。在本研究中，我们利用异质结构设计了一种超强双相（拉维斯+B2）铝钴铁镍铌高熵合金，该合金在室温下具有较低的磨损率（3.82×10-6 mm3/（N-m））。在球对盘滑动摩擦试验中，这种与 Al2O3 球对应的耐磨性源于超细 Laves 薄片在异质界面约束下的活化变形能力。此外，随着摩擦应力的增强，表面变形机制从基面和金字塔面上的位错滑移转变为拉维斯相内局部剪切和晶粒旋转的独特组合。我们的研究为减轻拉夫相金属间化合物在摩擦载荷下的脆化效应和开发耐磨材料提供了新的视角。

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来源期刊

Friction Engineering-Mechanical Engineering

CiteScore

12.90

自引率

13.20%

发文量

324

审稿时长

13 weeks

期刊介绍： Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.