Bulut, CanerYildiz, FatihVarol, TemelAkcay, Serhat BerkErguder, Tevfik Oguzhan2026-03-262026-03-2620261059-94951544-102410.1007/s11665-025-11639-y2-s2.0-105009609842https://doi.org/10.1007/s11665-025-11639-yhttps://hdl.handle.net/20.500.14901/2963In 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 degrees C for 2 h. The microstructural, mechanical, tribological, and corrosion properties of Ti-free (HEA-Ti-0-B), 3% Ti-added (HEA-Ti-3-B), and 5% Ti-added (HEA-Ti-5-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 degrees C, the HEA-Ti-0-P powders exhibited a mass gain of approximately 15.82%, while HEA-Ti-3-P and HEA-Ti-5-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-0-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-5-B. Ti addition significantly enhanced mechanical performance, with HEA-Ti-5-B exhibiting the highest hardness (348.82 HB), a 32.2% improvement over HEA-Ti-0-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-0-B) to 37.27 mpy (HEA-Ti-5-B). These findings highlight the trade-off between mechanical strength and electrochemical stability in Ti-containing HEAs.eninfo:eu-repo/semantics/closedAccessCOCRFEMNNITIXHigh-Entropy AlloysMicrostructurePowder MetallurgyWearArticle