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Materials
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Tribological Behaviors of Metallic Materials and Their Surface Research
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Tribological Behaviors of Metallic Materials and Their Surface Research

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 3096

Special Issue Editor

Dr. Arnaud Caron

E-Mail Website
Guest Editor
School of Energy Materials and Chemical Engineering, KOREATECH—Korea University of Technology & Education, Cheonan 31253, Korea
Interests: metals; glasses; surface science; tribology; mechanical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Friction losses and metal failure caused by wear have a significant impact on the economy and environment. With the recent advances in material characterization techniques, an in-depth understanding of the underlying mechanisms of friction and wear has become accessible. In parallel, the newly gained knowledge has been translated in the development and engineering of new materials, surfaces, and lubricants.

This Special Issue on the “Tribological Behaviors of Metallic Materials and Their Surface Research” is intended to serve as a forum covering recent developments in the fields of friction and wear of metallic materials. Potential topics include the multi-scale analysis of friction and wear of metals (both experimental and theoretical) in various environments (UHV, ambient, or corrosive) and under various conditions (i.e., dry or lubricated), the engineering of surfaces by texturing or coating, and the development of new lubricants (solid, oil-based, ionic liquid-based, and green lubricants).

Dr. Arnaud Caron
Guest Editor

Manuscript Submission Information

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Keywords

  • metals and alloys
  • surfaces
  • coatings
  • friction
  • wear
  • lubrication

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Published Papers (1 paper)

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Research

13 pages, 5303 KiB  
Article
The Effect of Copper on the Microstructure, Wear and Corrosion Resistance of CoCrCuFeNi High-Entropy Alloys Manufactured by Powder Metallurgy
by Samat Mukanov, Pavel Loginov, Alexander Fedotov, Marina Bychkova, Maria Antonyuk and Evgeny Levashov
Materials 2023, 16(3), 1178; https://doi.org/10.3390/ma16031178 - 30 Jan 2023
Cited by 17 | Viewed by 2743
Abstract
This paper focuses on the microstructure, phase composition, mechanical, tribological and corrosion properties of high-entropy alloys (HEAs) in the CoCrCuFeNi system depending on copper content, which was varied from 0 to 20 at. % with an increment of 5%. CoCrCuFeNi alloys were manufactured [...] Read more.
This paper focuses on the microstructure, phase composition, mechanical, tribological and corrosion properties of high-entropy alloys (HEAs) in the CoCrCuFeNi system depending on copper content, which was varied from 0 to 20 at. % with an increment of 5%. CoCrCuFeNi alloys were manufactured by powder metallurgy methods: mechanical alloying and hot pressing of element mixtures. The solubility limit of copper in CoCrFeNi solid solution was found to be 9 at. %. Segregation of irregularly shaped copper grains sized 1–30 μm is observed at concentrations above this solubility limit. As copper concentration increases, the phase composition of CoCrCuFeNi alloys changes from the single phase based on FCC1 solid solution (Cu = 0–5 at. %) to the dual-phase FCC1 + FCC2 alloy (Cu = 10–20 at. %), where FCC1 is the main phase and FCC2 is the secondary copper-rich phase. Tribological tests have shown that doping the CoCrFeNi alloy with copper increased wear resistance by 23% due to solid solution hardening. As copper content rises above 20%, the content of the secondary FCC2 phase increases, while wear resistance and alloy hardness decline. An analysis of wear tracks and wear products has shown that abrasion of CoCrCuFeNi alloys occurs via the abrasive-oxidative wear mechanism. The corrosion tests of CoCrCuFeNi HEAs in 3.5% NaCl solution had demonstrated that doping the alloy with copper at low concentrations (5–10%) leads to decreasing of corrosion resistance, possibly due to the formation of undesirable oxide Cu2O along with protective Cr2O3. At high copper concentrations (15–20%) galvanic corrosion is suppressed due to coarsening of FCC2 grains and thus decreasing the specific contact surface area between the cathode (FCC2) and the anode (FCC1). Full article
(This article belongs to the Special Issue Tribological Behaviors of Metallic Materials and Their Surface Research)
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