Sputter-deposited TiVCrZrW high entropy alloy film: Structure and tribological properties

Atomic Radius Mismatch: A Key Parameter for Design and Synthesis of High‐Entropy Physical Vapor Deposition Coatings—Review

“…In general, HESCs can be classified into three groups: crystalline, amorphous, and composite ( Figure ). The first category includes crystalline coatings, which can be divided into two groups: HEAs such as TiVCrZrW [ 70 ] and HECes such as (HfNbTiVZr)N. [ 17 ] The HESCs with a crystalline structure usually appear in two types of fcc and bcc structures. Crystalline HESCs can be as simple‐disordered phases such as bcc and simple‐ordered phases such as B2.…”

“…Therefore, PVD is a suitable and versatile technique to develop and prepare HEM coatings. [67][68][69] Various PVD subcategories are used for their development, including magnetron sputtering, [70][71][72][73] arc evaporation, [74][75][76] high-power impulse magnetron sputtering (HIPIMS), [77][78][79] or ion plating. [20,80] Generally, PVD coatings can be divided into six different generations.…”

Robust Low-Friction and Low-Wear TiNbMoTaCr High-Entropy Film Enabled by Periodically Inserting Curved MoS2 Sheets

“…13−15 However, although the high strength and hardness of refractory HEA films are conducive to wear resistance during the friction process, it is susceptible to abrasive wear and result in a high coefficient of friction (COF). 16 The high value of COF usually leads to high shear forces on the rubbing surfaces, which not only leads to severe wear and energy waste but also reduces the stability, efficiency, and durability of the moving parts. 17 It means that the quest to optimize the tribological properties of HEA films including low COF and low wear is urgently needed, which can extend the service life of HEA films and expand the development of protective films.…”

“…Accordingly, the combination of excellent properties enables HEAs to exhibit a promising potential for vast applications as a protective film on machine parts, medical implants, cutting tools, microelectromechanical systems, etc. for improving mechanical, wear-, and/or corrosion-resistance properties. − However, although the high strength and hardness of refractory HEA films are conducive to wear resistance during the friction process, it is susceptible to abrasive wear and result in a high coefficient of friction (COF) . The high value of COF usually leads to high shear forces on the rubbing surfaces, which not only leads to severe wear and energy waste but also reduces the stability, efficiency, and durability of the moving parts .…”