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<p>In this study, high purity Co–Cr–Fe–Mn–Ni–Ti powders were produced by mechanical alloying, hot pressed at 650&#xa0;MPa, and then sintered at 1000&#xa0;°C for 2&#xa0;h. The microstructural, mechanical, tribological, and corrosion properties of Ti-free (HEA-Ti<sub>0</sub>-B), 3% Ti-added (HEA-Ti<sub>3</sub>-B), and 5% Ti-added (HEA-Ti<sub>5</sub>-B) high-entropy alloys (HEAs) were systematically investigated. The changes in the mass of the alloy powder materials were evaluated as a function of temperature and time using thermogravimetric analysis (TGA). At 850&#xa0;°C, the HEA-Ti<sub>0</sub>-P powders exhibited a mass gain of approximately 15.82%, while HEA-Ti<sub>3</sub>-P and HEA-Ti<sub>5</sub>-P showed increases of 26.83 and 28.55%, respectively. As confirmed by TGA, the increasing Ti content in the alloy powders led to a decrease in oxidation resistance. Microstructural analysis revealed that HEA-Ti<sub>0</sub>-B exhibited a single-phase FCC structure, whereas Ti-containing alloys formed intermetallic phases. Porosity increased with Ti content, reaching 13.97% in HEA-Ti<sub>5</sub>-B. Ti addition significantly enhanced mechanical performance, with HEA-Ti<sub>5</sub>-B exhibiting the highest hardness (348.82 HB), a 32.2% improvement over HEA-Ti<sub>0</sub>-B, alongside a 15.93% lower wear rate and 43.1% reduction in friction coefficient. However, in 3.5% NaCl medium, corrosion resistance decreased with increasing Ti addition and corrosion rates increased from 23.21 mpy (HEA-Ti<sub>0</sub>-B) to 37.27 mpy (HEA-Ti<sub>5</sub>-B). These findings highlight the trade-off between mechanical strength and electrochemical stability in Ti-containing HEAs.</p>

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Influence of Ti on Structure, Tribology, and Corrosion of CoCrFeMnNiTix High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Caner Bulut,
  • Fatih Yıldız,
  • Temel Varol,
  • Serhat Berk Akçay,
  • Tevfik Oğuzhan Ergüder

摘要

In this study, high purity Co–Cr–Fe–Mn–Ni–Ti powders were produced by mechanical alloying, hot pressed at 650 MPa, and then sintered at 1000 °C for 2 h. The microstructural, mechanical, tribological, and corrosion properties of Ti-free (HEA-Ti0-B), 3% Ti-added (HEA-Ti3-B), and 5% Ti-added (HEA-Ti5-B) high-entropy alloys (HEAs) were systematically investigated. The changes in the mass of the alloy powder materials were evaluated as a function of temperature and time using thermogravimetric analysis (TGA). At 850 °C, the HEA-Ti0-P powders exhibited a mass gain of approximately 15.82%, while HEA-Ti3-P and HEA-Ti5-P showed increases of 26.83 and 28.55%, respectively. As confirmed by TGA, the increasing Ti content in the alloy powders led to a decrease in oxidation resistance. Microstructural analysis revealed that HEA-Ti0-B exhibited a single-phase FCC structure, whereas Ti-containing alloys formed intermetallic phases. Porosity increased with Ti content, reaching 13.97% in HEA-Ti5-B. Ti addition significantly enhanced mechanical performance, with HEA-Ti5-B exhibiting the highest hardness (348.82 HB), a 32.2% improvement over HEA-Ti0-B, alongside a 15.93% lower wear rate and 43.1% reduction in friction coefficient. However, in 3.5% NaCl medium, corrosion resistance decreased with increasing Ti addition and corrosion rates increased from 23.21 mpy (HEA-Ti0-B) to 37.27 mpy (HEA-Ti5-B). These findings highlight the trade-off between mechanical strength and electrochemical stability in Ti-containing HEAs.