{"title":"Microstructure, mechanical and wear behavior of AlxTi(1−x)CoCrFeNi (x = 0.875, 0.75) high-entropy coatings fabricated via HVOF and post-annealing","authors":"","doi":"10.1016/j.triboint.2024.110248","DOIUrl":null,"url":null,"abstract":"<div><p>Al<sub>x</sub>Ti<sub>(1−x)</sub>CoCrFeNi (x = 0.875, 0.75) high-entropy coatings (HECs) were prepared using High-Velocity Oxygen-Fuel technology, and then underwent vacuum annealing at 500 ℃, 700 ℃, 900 ℃, and 1100 ℃, respectively. The sprayed coatings exhibited BCC phase, with the hardness increasing as the Ti content added. The wear mechanism of the HECs included abrasive, adhesion and oxidation wear. The microstructure and phase structure of the HECs annealed at 500 ℃ were basically consistent with the as-sprayed coatings. The Al<sub>0.75</sub>Ti<sub>0.25</sub>CoCrFeNi HEC nanohardness reached the peak (19.6 ± 1.1 GPa) and had the best wear resistance (1.8 ×10<sup>−5</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup>) due to the grain boundary dislocation source strengthening. With the annealing temperature increasing, the BCC to FCC phase transition occurred, the grains coarsened, the hardness decreased, and oxidation wear were intensified.</p></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tribology International","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301679X24010004","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
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Abstract
AlxTi(1−x)CoCrFeNi (x = 0.875, 0.75) high-entropy coatings (HECs) were prepared using High-Velocity Oxygen-Fuel technology, and then underwent vacuum annealing at 500 ℃, 700 ℃, 900 ℃, and 1100 ℃, respectively. The sprayed coatings exhibited BCC phase, with the hardness increasing as the Ti content added. The wear mechanism of the HECs included abrasive, adhesion and oxidation wear. The microstructure and phase structure of the HECs annealed at 500 ℃ were basically consistent with the as-sprayed coatings. The Al0.75Ti0.25CoCrFeNi HEC nanohardness reached the peak (19.6 ± 1.1 GPa) and had the best wear resistance (1.8 ×10−5 mm3 N−1 m−1) due to the grain boundary dislocation source strengthening. With the annealing temperature increasing, the BCC to FCC phase transition occurred, the grains coarsened, the hardness decreased, and oxidation wear were intensified.
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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