High temperature tribology of CuMoTaWV high entropy alloy

Alvi, Sajid; Akhtar, Farid

doi:10.1016/j.wear.2018.12.085

Cited by 72 publications

(20 citation statements)

References 55 publications

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“…In this case, Fe 2 O 3 , Cr 2 O 3 , Al 2 O 3 and Al(OH) 3 , formed on the worn surfaces of Al x FeCrNiCo x and reduced the wear rate. Alvi et al [478] studied wear behavior of AlCoCrFeNi in the temperature range of RT-600 • C. They noticed that the oxidation of Cu (into CuO) causes wear rate decrease at 400 • C. Joseph et al [365] analyzed wear behavior of Al x CoCrFeNi in the temperature range of RT-900 • C. The wear resistance of this HEA surpassed that of Inconel 718 at 900 • C. Here again, the wear resistance was enhanced at the higher temperatures thanks to the oxide layer formed at the contact interface.…”

Section: Higher Temperatures Wear Resistancementioning

confidence: 99%

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

Sonal

Lee

2021

Metals

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Alloying has been very common practice in materials engineering to fabricate metals of desirable properties for specific applications. Traditionally, a small amount of the desired material is added to the principal metal. However, a new alloying technique emerged in 2004 with the concept of adding several principal elements in or near equi-atomic concentrations. These are popularly known as high entropy alloys (HEAs) which can have a wide composition range. A vast area of this composition range is still unexplored. The HEAs research community is still trying to identify and characterize the behaviors of these alloys under different scenarios to develop high-performance materials with desired properties and make the next class of advanced materials. Over the years, understanding of the thermodynamics theories, phase stability and manufacturing methods of HEAs has improved. Moreover, HEAs have also shown retention of strength and relevant properties under extreme tribological conditions and radiation. Recent progresses in these fields are surveyed and discussed in this review with a focus on HEAs for use under extreme environments (i.e., wear and irradiation) and their fabrication using additive manufacturing.

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Section: Higher Temperatures Wear Resistancementioning

confidence: 99%

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

Sonal

Lee

2021

Metals

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“…When testing the Cantor alloy against both materials, wear rates were lower for ceramic counter bodies [ 45 , 46 ]. For another set of HEAs that included Mo and Ta along with variations, wear rates were better against steel [ 42 , 44 , 47 ]. The mechanism is discussed in the following section.…”

Section: Mechanical and Tribological Properties Of The Heasmentioning

confidence: 99%

“…Additionally, the range of both hardness and wear rate values is larger than for the BCC phase group. The additions of Cu [ 45 , 47 ], and Ni [ 45 ] have been shown to promote and stabilize FCC phases. For many applications, better wear properties may be desired, but the FCC phase may have a role when high ductility is required.…”

Section: Mechanical and Tribological Properties Of The Heasmentioning

confidence: 99%

“…Figure 11 illustrates the softening of these materials as temperatures increase; the BCC phases noticeably have the highest hardness values, but all materials soften at close to the same rate. A few alloying materials had been shown to improve the hot hardness, including the addition of Mo [ 47 ] and Cu [ 69 ]. Hardness values for the HEAs in this review tested beyond room temperature are compared to two common materials (Inconel 718 and Austenitic steel) for perspective.…”

Section: Mechanical and Tribological Properties Of The Heasmentioning

confidence: 99%

“…The consideration of oxide formation is a significant aspect of choosing which elements are used in a high-entropy alloy that is intended for high-temperature applications. The addition of W and V [ 47 ], Fe [ 50 ], C [ 29 ], and Nb [ 60 ] promoted improvements in wear resistance at high temperatures due to the creation of a strong oxide layer. At certain ratios, the influence of these elements tapered off or no longer aided.…”

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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A further examination of MoTaxNbVTi (x = 0.25, 0.50, 0.75 and 1.00 at.%) high-entropy alloy system: microstructure, mechanical behavior and surface degradation phenomena

et al. 2020

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High temperature tribology of CuMoTaWV high entropy alloy

Cited by 72 publications

References 55 publications

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

Recent Advances in Additive Manufacturing of High Entropy Alloys and Their Nuclear and Wear-Resistant Applications

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

A further examination of MoTaxNbVTi (x = 0.25, 0.50, 0.75 and 1.00 at.%) high-entropy alloy system: microstructure, mechanical behavior and surface degradation phenomena

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