Effect of heat treatment on the microstructure, microhardness, and wear characteristics of AlCrFeCuNi high-entropy alloy

Malatji, N.; Lengopeng, Thabo; Pityana, Sisa; Popoola, A. P. I.

doi:10.1007/s00170-020-06220-x

Cited by 24 publications

(5 citation statements)

References 29 publications

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“…Malatji et al prepared the AlCrFeNiCu HEA coating through laser metal technique and found that the annealed coatings exhibited a better tribological performance than that of the as‐cladded coating. [ 115 ] The XRD and EDS results indicated that the heat‐treated coatings were mainly composed of BCC and FCC solid solution phases, independent of annealing temperature. The coating that was heat treated at 900 °C showed the best tribological performance and the highest hardness.…”

Section: The Tribological Performances Of Heas Under Dry Environmentmentioning

confidence: 99%

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 Tribological Performances Of Heas Under Dry Environmentmentioning

confidence: 99%

A Review on the Tribological Performances of High‐Entropy Alloys

Chen

Zhu

2022

Adv Eng Mater

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“…CoCrFeNiNb x [242], Al x CoCrFeNi [243][244][245]259,264], AlCoCrFeNi 2.1 [246,264], AlCrFeMoV x [247], AlCoCrFeNiTi 0.5 [248], AlCrCuFeNi [249,263], AlCoCrFeNiCu/AlTiCrFeCoNi [250,251], NbMoTaW [252], TiZrNbMoV [253], NbMoTaTi x Ni x [260], CoCrFeNb 0.2 Ni 2.1 [265] and TiZrNbHfTa [254].…”

Section: Additive Manufacturing Of Heasmentioning

confidence: 99%

“…Here, the wear resistance of the HEA was found to be directly proportional to the hardness. Malatji et al [263] improved the wear resistance of AlCrCuFeNi by heat treating at temperatures 800, 950 and 1100 • C. The microhardness increased from 310 to 381 HV when heat treated at 800 • C but decreased to 365 HV when heat treated at 1100 • C. Heat treatment at 1100 • C homogenized the microstructure and promoted grain coarsening. This alloy initially had the FCC phase alone.…”

Section: Use Of Media and Heat Treatmentmentioning

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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“…[4][5][6][7][8][9] Moreover, additional studies have demonstrated that the corrosion properties of metals can be improved with heat treatment, with a sacrificial element during the synthesis process, or by alloying with another metal. [10][11][12][13][14][15][16] Generally, heat treatment and the alloying process help to modify the microstructure of the material, which can be the main reason why the stability of materials is enhanced. [15][16][17][18] With the intention to cover some of the energetic demands and environmental issues, the application of nanoparticles (NPs) as catalytic electrodes has grown in the last years, and efforts have been made to improve their catalytic activity in electrochemical processes such as CO reduction/oxidation, hydrogenation reactions, and oxygen reduction reactions (ORR).…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14][15][16] Generally, heat treatment and the alloying process help to modify the microstructure of the material, which can be the main reason why the stability of materials is enhanced. [15][16][17][18] With the intention to cover some of the energetic demands and environmental issues, the application of nanoparticles (NPs) as catalytic electrodes has grown in the last years, and efforts have been made to improve their catalytic activity in electrochemical processes such as CO reduction/oxidation, hydrogenation reactions, and oxygen reduction reactions (ORR). [19][20][21][22][23] In order to reduce production costs and improve the efficiency of catalytic processes, researchers have focused on the synthesis and characterization of nanoparticles to optimize their size, shape, composition, and chemical structure.…”

Section: Introductionmentioning

confidence: 99%