The sliding wear behaviour of CoCrFeMnNi and AlxCoCrFeNi high entropy alloys at elevated temperatures

Joseph, Jithin; Haghdadi, N.; Shamlaye, Karl F.; Hodgson, Peter; Barnett, Matthew; Fabijanic, Daniel

doi:10.1016/j.wear.2019.03.002

Cited by 346 publications

(97 citation statements)

References 42 publications

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“…Herein, the friction coefficients of composites increase as the TiO 2 content reaches up to 6 wt.% over a wide temperature range. The high-temperature oxidation is a positive factor for the tribology of materials 4,11,32,33 . The metal oxides and other compounds can form oxides film on the wear tracks, and the high coverage of oxides film leads to the low wear rates and friction coefficients at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

Nano-TiO2 reinforced CoCr matrix wear resistant composites and high-temperature tribological behaviors under unlubricated condition

Cui

Liu

et al. 2020

Sci Rep

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the cocrMo matrix composites with nano-tio 2 particle (2 wt.%, 4 wt.% and 6 wt.%) were fabricated by using a powder metallurgy technique (P/M), and the nano-TiO 2 content was optimized in matrix. The microstructures, mechanical and high-temperature tribological properties of the synthesized composites were systematically studied. Friction and wear behaviors were studied by using a disk-onball tribo-tester sliding against Si 3 n 4 ceramic ball from room temperature (23 o C) to 1000 o C in air. TiO 2 obviously strengthened the hardness and high-temperature wear resistance of composites. It was attributed to the high load-carrying capacity of matrix, in-situ formed high-temperature solid lubricants and stable oxides film on the wear tracks. 4 wt.% TiO 2 was the critical threshold at which there was a transition of tribological properties over a broad temperature range. The composite containing 4 wt.% nano-TiO 2 exhibited the most reasonable high-temperature friction coefficient and wear rate at all testing temperatures. At different testing temperatures, the composites showed different wear mechanisms.

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Section: Resultsmentioning

confidence: 99%

Nano-TiO2 reinforced CoCr matrix wear resistant composites and high-temperature tribological behaviors under unlubricated condition

Cui

Liu

et al. 2020

Sci Rep

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“…According to the Equations (15)(16)(17)(18), the material constants α, n, Q and A can be calculated under different strains, and thus the same values are substituted in Equation 5to obtain the constitutive equations at different strain rates. The corresponding stress values can be evaluated from Equation (11).…”

Section: Arrhenius Type Constitutive Equationmentioning

confidence: 99%

“…The number of HEA compositions under investigation is increasing steadily due to the evergrowing interest and research efforts in this field, particularly driven by their superb properties [12]. Notable among the exceptional mechanical properties are high strength at elevated temperatures, excellent cryogenic toughness [13][14][15][16], high wear resistance [17][18][19], good thermal stability [20][21][22], excellent fracture toughness [14,23,24] and superior corrosion resistance [25]. Thus far, CoCrFeMnNi is the most studied HEA [26][27][28][29][30] and is also called as 'Cantor alloy' named after Cantor et al [2] for their first studies of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy

Patnamsetty

Saastamoinen

Somani

et al. 2020

Science and Technology of Advanced Materials

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Models describing the constitutive flow behaviour of a metallic material are desired for appropriate process design and realization of defect-free components. In this study, constitutive equations based on the hyperbolic-sinusoidal Arrhenius-type model have been developed to define the hot deformation characteristics of a CoCrFeMnNi high-entropy alloy. The experimental true stress-true strain data were generated over a wide temperature (1023-1423 K) and strain rates (10 −3-10 s −1) ranges. The impact of strain rate and temperature on deformation behaviour was further characterized through a temperature compensated strain rate parameter, i.e. Zener-Hollomon parameter. Additionally, a mathematical relation was employed to express the influence of various material constants on true-strain ranging from 0.2 to 0.75. Typical third order polynomial relations were found to be appropriate to fit the true-strain dependency of these material constants. The accuracy of the developed constitutive equations was evaluated by using the average absolute relative error (AARE) and correlation coefficient (R); the obtained values were 7.63% and 0.9858, respectively, suggesting reasonable predictions. These results demonstrate that the developed constitutive equations can predict the flow stress behaviour of the alloy with a good accuracy over a wide range of temperature and strain rate conditions and for large strains.

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“…The emergence of oxide film and enhanced thermal stability revealed the improved wear resistance of HEA coating at high temperature. Joseph et al [23] investigated the tribological mechanism of CoCrFeMnNi and AlxCoCrFeNi high entropy alloys at different temperature range and results were compared with AISI 304 and Inconel 718. AlCoCrFeNi HEA showed excellent wear resistance compared to other HEAs test specimen at different temperature range…”

Section: Effect Of Environmental Conditions On Wear Mechanism and mentioning

confidence: 99%

Wear Behavior and Tribological Evolution of High Entropy Alloys

2019

IJRTE

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High entropy alloy are equiatomic and nonequiatomic complex concentrated/ multicomponent alloys which are recognized due to their distinctive mechanical and triboligical properties. A unique combination of excellent mechanical and tribological properties of high entropy alloys makes them promising candidate for variety of industrial and structural applications. The wear resistance needs to be examined for these complex concentrated alloys as only few numbers of reports and investigation are available in the field of new advanced HEAs materials. In the current research work, we identified the crucial achievements and breakthrough in the wear and tribological investigations of high entropy alloy and HEA based composites in recent years. This review article investigates the tribological behaviors of multicomponent alloys /high entropy alloys and HEA based composites which play an important role and draw a considerable attention in the present era. In view of recent developments on tribological and wear related mechanisms of HEAs for different type of industrial and structural applications, microstructure, chemical compositions, and mechanical properties are explained and reviewed in this review article.

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The sliding wear behaviour of CoCrFeMnNi and AlxCoCrFeNi high entropy alloys at elevated temperatures

Cited by 346 publications

References 42 publications

Nano-TiO2 reinforced CoCr matrix wear resistant composites and high-temperature tribological behaviors under unlubricated condition

Nano-TiO2 reinforced CoCr matrix wear resistant composites and high-temperature tribological behaviors under unlubricated condition

Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy

Wear Behavior and Tribological Evolution of High Entropy Alloys

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