Mechanical, Tribological, and Corrosion Resistance Properties of (TiAl<sub>x</sub>CrNbY)N<sub>y</sub> High-Entropy Coatings Synthesized Through Hybrid Reactive Magnetron Sputtering

Mechanical, Tribological, and Corrosion Resistance Properties of (TiAl<sub>x</sub>CrNbY)N<sub>y</sub> High-Entropy Coatings Synthesized Through Hybrid Reactive Magnetron Sputtering

This study investigates the effects of aluminum and nitrogen content on the microstructure, mechanical properties, and tribological performance of high-entropy coatings based on (TiCrAl<sub>x</sub>NbY)N<sub>y</sub> systems. Using a hybrid magnetron sputtering technique, both...

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Bibliographic Details
Main Authors: Nicolae C. Zoita, Mihaela Dinu, Anca C. Parau, Iulian Pana, Adrian E. Kiss
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Crystals
Subjects:
high-entropy alloys
microstructure
mechanical properties
tribological properties
electrochemical properties
Online Access:https://www.mdpi.com/2073-4352/14/11/993
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Summary:This study investigates the effects of aluminum and nitrogen content on the microstructure, mechanical properties, and tribological performance of high-entropy coatings based on (TiCrAl<sub>x</sub>NbY)N<sub>y</sub> systems. Using a hybrid magnetron sputtering technique, both metallic and nitride coatings were synthesized and evaluated. Increasing the aluminum concentration led to a transition from a crystalline to a nanocrystalline and nearly amorphous (NC/A) structure, with the TiAl<sub>0.5</sub>CrNbY sample (11.8% Al) exhibiting the best balance of hardness (6.8 GPa), elastic modulus (87.1 GPa), and coefficient of friction (0.64). The addition of nitrogen further enhanced these properties, transitioning the coatings to a denser fine-grained FCC structure. The HN2 sample (45.8% nitrogen) displayed the highest hardness (21.8 GPa) but increased brittleness, while the HN1 sample (32.9% nitrogen) provided an optimal balance of hardness (14.3 GPa), elastic modulus (127.5 GPa), coefficient of friction (0.60), and wear resistance (21.2 × 10<sup>−6</sup> mm<sup>3</sup>/Nm). Electrochemical impedance spectroscopy revealed improved corrosion resistance for the HN1 sample due to its dense microstructure. Overall, the (TiAl<sub>0.5</sub>CrNbY)N<sub>0.5</sub> coating achieved the best performance for friction applications, such as break and clutch systems, requiring high coefficients of friction, high wear resistance, and durability.
ISSN:2073-4352

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