| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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| Presentation Title |
Alloy Design, Microstructure, and Mechanical Properties of CoFeNi Medium Entropy Alloy with Vanadium and Carbon Addition |
| Author(s) |
Hamshini Rajendran, Reza Gholizadeh, Yoshida Shuhei, Tsuji Nobuhiro |
| On-Site Speaker (Planned) |
Hamshini Rajendran |
| Abstract Scope |
This study investigated the impact of C and V additions on enhancing the mechanical properties of CoFeNi FCC-based MEA. Ingots of (CoFeNi)90-XV10CX (X = 0, 1.35, 3.2 at%) were fabricated by vacuum arc-melting. The addition of V and C led to the formation of a novel hypoeutectic microstructure comprising an FCC matrix and sub-micrometer-sized V-rich carbides. Notably, the volume fraction of carbides increased from ~4% in C1.35 to ~10% in C3.2 alloy. Subsequent cold rolling (85% reduction in thickness) and annealing (800°C-700°C) resulted in heterogeneous recrystallized microstructures, with ultrafine FCC grains in carbide-rich regions, and relatively larger grains in carbide-free regions. These carbide-reinforced bimodal grain structures significantly improved strength, with alloy C3 showing ~50% and ~30% increase in YS and UTS respectively compared to the reference alloy(C0), along with ~30% total elongation. This presentation offers insights into the thermo-mechanical processing of hypoeutectic microstructures and the strengthening mechanisms of V-and-C-added CoFeNi alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |