Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

Erdoğan, Azmi; Gök, Mustafa Sabri; Zeytin, Sakin

doi:10.1007/s40544-019-0278-2

Cited by 49 publications

(18 citation statements)

References 30 publications

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“…the initial unstable region where the COF is rapidly increased because the tip is trying to settle down and the subsequent steady-state region where the COF is nearly constant. This is exactly similar to the results reported in other tribology studies [61,62]. In terms of the steady-state region, the COF profile varies in its height with the annealing temperature.…”

Section: Nano-tribological Propertiessupporting

confidence: 90%

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

Zeng

2020

Friction

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The microstructure, mechanical and micro/nano-tribological properties of the 60NiTi film annealed at different temperature were investigated. The results reveal that annealing as-deposited 60NiTi film at 300, 375, and 600 °C for 1 h leads to structural relaxation, partial crystallization and full crystallization, respectively. Compared with the structurally relaxed structure, the partially crystallized structure exhibits increased hardness but decreased elastic modulus. This is because that the elastic modulus is reduced by Voigt model while the hardness is improved by composite effect. Due to the highest hardness and ratio of hardness to elastic modulus (H/E), the partially crystallized 60NiTi film has the lowest penetration depth and residual depth (i.e., groove depth). Besides, the results also reveal that ductile plowing is the dominant wear mechanism for all the annealed 60NiTi films. Under the condition of the ductile plowing, coefficient of friction and wear resistance are related to penetration depth and residual depth, respectively. Therefore, the partially crystallized 60NiTi film shows the best tribological performance at the micro/nano-scale. The current work not only highlights the important roles of hardness and H/E in improving the micro/nano-tribological properties but also concludes an efficient and simple method for simultaneously increasing hardness and H/E.

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Section: Nano-tribological Propertiessupporting

confidence: 90%

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

Zeng

2020

Friction

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“…At high temperatures, synergistic effect of the Cr x S y phase and formation of different oxides on the sliding surfaces leads to the improved tribological properties of HEA. Erdoğan et al [550] also prepared CoCrFeNiTi 0.5 Al x high entropy alloys with varying Al content by induction melting and studied their dry sliding wear behaviour at various temperatures. The high entropy alloys containing high Al content exhibited superior wear resistance.…”

Section: Solid Lubricant or Self-lubricating Materialsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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“…The inclusion of Al and Ti similarly increased hardness and reduced wear rates [ 20 , 25 ]. Adding Bi reduced the coefficient of friction (COF) [ 26 ], the addition of Ti and Zr both improved wear rates [ 27 ], and Mo increased hardness [ 28 ]. The addition of carbon and Cr 3 C 2 both increased the hardness but consequently reduced the ductility of the part and, at some ratios, was ill-advised due to excessive brittleness [ 29 , 30 ].…”

Section: Design Of Heasmentioning

confidence: 99%

“…A significant amount of work considers what ratios of what elements added to this alloy can promote BCC phases. It has been documented that the addition of V [ 24 ], Al [ 20 , 22 , 26 ], Fe [ 50 ], and Ti [ 66 ] all promote the development and stabilization of BCC phases in HEAs. The addition of these elements to the base high-entropy alloy may increase the likelihood of developing a material with BCC phases, but this comes at the cost of reducing the plasticity of the material.…”

Section: Mechanical and Tribological Properties Of The Heasmentioning

confidence: 99%

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Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

2021

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High-entropy alloys (HEAs) are composed of multiple elements with equimolar or near equimolar composition that have superior mechanical and tribological properties. In this article, we present a review on the tribological performance of HEAs. The tribological properties of different HEAs systems have been evaluated, and it has been found that the wear rate strongly depends on the crystal structure of the phases. The most common structures are face-centered cubic (FCC), body-centered cubic (BCC), and dual-phase (FCC + BCC) alloys due to the high entropy of mixing instead of forming intermetallic phases. In general, HEAs with a BCC structure showed superior hardness and wear properties compared to FCC and FCC + BCC alloys. The lesser wear rate of HEAs with a BCC structure is attributed to the reductions in ductility, resulting in strong but brittle alloys. In addition to the crystal structure, the effect of temperature on the tribological performance of the HEAs is also discussed, which highlights their potential applications for high temperatures. Moreover, various other factors such as grain size, formation of an oxide layer, and wear mechanisms are discussed.

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Analysis of the high-temperature dry sliding behavior of CoCrFeNiTi0.5Alx high-entropy alloys

Cited by 49 publications

References 30 publications

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

Enhanced micro/nano-tribological performance in partially crystallized 60NiTi film

A review of recent advances in tribology

Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

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