Significant reduction in friction and wear of a high-entropy alloy via the formation of self-organized nanolayered structure

Lu, Yang; Cheng, Zhuo; Zhu, Weiwei; Zhao, Chong; Ren, Fuzeng

doi:10.1016/j.jmst.2020.08.065

Cited by 51 publications

(11 citation statements)

References 31 publications

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“…Yang et al designed a novel (CoCrFeNi) 90 Ag 10 HEA, consisting of an FCC phase structure with low stacking fault energy (SFE), and studied its wear performance though a ball-on-disk tribometer. [103] Compared with the equiatomic CoCrFeNi HEA, the (CoCrFeNi) 90 Ag 10 HEA exhibits an improved wear performance. During dry sliding, the initial spherical Ag precipitates near the sliding surface evolved to a nanolayered structure and formed a self-organized nanolayer on the sliding interfaces, thus significantly reducing the COF and wear rate.…”

Section: The Influence Of Solid Lubricants On the Tribological Perfor...mentioning

confidence: 98%

A Review on the Tribological Performances of High‐Entropy Alloys

Chen

Zhu

2022

Adv Eng Mater

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Wear is an important form of material loss and failure, and it is usually inevitable in almost all mechanical systems with moving parts. The durability and reliability of engineering components are closely related to their wear resistance. Developing advanced materials to alleviate energy and materials losses in moving mechanical systems still remains a great challenge nowadays. The emergence of novel high‐entropy alloys (HEAs) that compose of multiple principal elements holds great promise for the development of materials with extraordinary wear resistance, due to their high hardness, high wear resistance, and excellent corrosion resistance. Herein, the current research progress of the tribology of HEAs under different conditions is reviewed, including high temperature, dry condition, corrosion solution, and oil lubrication. Specifically, the effects of compositions, microstructures, lubricants, and protective oxide layers on the tribological performance of HEAs are summarized. Furthermore, the underlying mechanisms that are responsible for the excellent wear resistance of HEAs under different conditions are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In view of the excellent tribological performances and the diversity of compositional design, HEAs have great potential to be applied in a wide range of mechanical systems to minimize wear.

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Section: The Influence Of Solid Lubricants On the Tribological Perfor...mentioning

confidence: 98%

A Review on the Tribological Performances of High‐Entropy Alloys

Chen

Zhu

2022

Adv Eng Mater

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“…Tribological damage occurs in the superficial layer of bulk material by forming debris and surface degradations within the contact area [17,18]. Accordingly, the microstructure beneath the damaged area undergoes the grain refinement process against the extreme shearing stress, which may further alter the fretting wear performance of bulk material [19,20]. To date, the governing deformation mechanisms involving grain rotation [12], dynamic recrystallization [21], activated slipping deformation [22], and twinning deformation [23] have been introduced to understand the tribology behavior of the materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and oxidation in α/β titanium alloy under fretting fatigue loading

et al. 2023

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Coupling effects of fretting wear and cyclic stress could result in significant fatigue strength degradation, thus potentially causing unanticipated catastrophic fractures. The underlying mechanism of microstructural evolutions caused by fretting wear is ambiguous, which obstructs the understanding of fretting fatigue issues, and is unable to guarantee the reliability of structures for long-term operation. Here, fretting wear studies were performed to understand the microstructural evolution and oxidation behavior of an α/β titanium alloy up to 108 cycles. Contact surface degradation is mainly caused by surface oxidation and the generation of wear debris during fretting wear within the slip zone. The grain size in the topmost nanostructured layer could be refined to ∼40 nm. The grain refinement process involves the initial grain rotation, the formation of low angle grain boundary (LAGB; 2°–5°), the in-situ increments of the misorientation angle, and the final subdivision, which have been unraveled to feature the evolution in dislocation morphologies from slip lines to tangles and arrays. The formation of hetero microstructures regarding the nonequilibrium high angle grain boundary (HAGB) and dislocation arrays gives rise to more oxygen diffusion pathways in the topmost nanostructured layer, thus resulting in the formation of cracking interface to separate the oxidation zone and the adjoining nanostructured domain driven by tribological fatigue stress. Eventually, it facilitates surface degradation and the formation of catastrophic fractures.

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“…According to the classical Archard law [ 8 ], the wear resistance of the materials can be enhanced if their initial bearing capacities (hardness/yield strength) are improved, which suppresses crack initiation and propagation on the worn surface. Over the past decades, numerous investigations aimed at reducing wear have been carried out in a variety of nanostructured alloys with high hardness due to the Hall–Petch relation, but the results show that there is no absolute correlation between wear resistance and initial bearing capacities [ 1 , 2 , 9 , 10 ]. Nanograins possess very limited strain hardening ability so that plastic incompatibility and strain localization occur during surface folding and cracking, which result in wear particles, invariably evoking a dramatic micro-cutting and three-body abrasion [ 1 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nanograins possess very limited strain hardening ability so that plastic incompatibility and strain localization occur during surface folding and cracking, which result in wear particles, invariably evoking a dramatic micro-cutting and three-body abrasion [ 1 , 11 ]. Experimental results in recent years give an illuminating picture about the wear resistance of the alloys that can be elevated when introducing heterogeneous structural evolutions to accommodate strain gradients along the friction interface, e.g., by introducing nanocomposite/amorphous tribo-layers [ 2 , 12 ], precipitation-reinforced interfaces [ 3 , 13 ], gradient nanograined subsurfaces [ 1 , 4 ], friction-induced nano-twins [ 14 , 15 ], crystallographic textures [ 16 ], and self-organized lubricating tribo-layers [ 10 , 17 ]. In particular, recent studies on the wear response of complex concentrated alloys (CCAs) have advanced the understanding of wear-driven friction interface protection.…”

Section: Introductionmentioning

confidence: 99%

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems. Inspired by high-entropy effects, here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni 50 (AlNbTiV) 50 complex concentrated alloy, which yields ultralow wear rate within the order of 10 −7 to 10 −6 mm 3 /Nm between room temperature and 800 °C. Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites, and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates. This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 °C to minimize adhesive and oxidative wear. Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.

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Significant reduction in friction and wear of a high-entropy alloy via the formation of self-organized nanolayered structure

Cited by 51 publications

References 31 publications

A Review on the Tribological Performances of High‐Entropy Alloys

A Review on the Tribological Performances of High‐Entropy Alloys

Microstructural evolution and oxidation in α/β titanium alloy under fretting fatigue loading

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

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