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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Thermodynamics and Kinetics of Alloys IV
Presentation Title Effect of Al and Ti Additions on Microstructures and Mechanical Properties of CoFeNi Medium Entropy Alloys
Author(s) Hung-Ju Chen, Ssu-Chi Huang, Yee-Wen Yen
On-Site Speaker (Planned) Hung-Ju Chen
Abstract Scope Co–Fe–Ni medium entropy alloys with FCC structure offer good ductility but limited strength. To enhance the strength, Al and Ti were added in this system. Phase predictions of Co30Fe30Ni20Al20-xTix HEAs (x = 5, 10, and 15 at.%) were calculated using Pandat 2024 software through point calculations at 1173 K. The results serve as a reference of two elements, Al and Ti, on the microstructures and mechanical properties of the CoFeNi-based MEAs. Three different compositions of Co30Fe30Ni20Al20-xTix HEAs (x = 5, 10, and 15 at.%) were fabricated using arc melting. The Co30Fe30Ni20Al20-xTix HEAs (x = 5, 10, and 15 at.%) exhibited phase transformation, from FCC + L12 + L21 phases, to FCC + L21 phases, and BCC + B2 phases respectively. Density measurements revealed that the overall density decreased with increasing Al content and decreasing Ti content. The lowest value is 7.31 g/cm3 which was measured in Alloy Co30Fe30Ni20Al15Ti5.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Titanium, Aluminum

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