About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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Presentation Title |
Precipitation/TRIP-Induced Heterogeneous Microstructures in Non-Equiatomic CoCrNi Medium Entropy Alloys to Achieve Superior Strength-Ductility Combination |
Author(s) |
Yu-Hsuan Huang, Chun-Hway Hsueh |
On-Site Speaker (Planned) |
Yu-Hsuan Huang |
Abstract Scope |
In this work, a series of (Co2CrNi)100-xCex medium entropy alloys (MEAs) was synthesized using high-vacuum arc melting to investigate effects of Ce addition on microstructures and mechanical properties of the MEAs. Tensile tests and nanoindentation were implemented to study mechanical properties of the MEAs. The hexagonal close-packed (HCP) CeNi5 precipitates formed in the face-centered cubic (FCC) matrix and the volume fraction of precipitates increased with the increasing Ce content. In addition, the matrix transformed from FCC to HCP structure during tensile loading to result in transformation-induced plasticity (TRIP). It was revealed that the yield strength and ultimate tensile strength increased but at the cost of ductility reduction with the increasing Ce content. The nanoindentation tests showed that the nanohardness of FCC matrix and HCP precipitates were approximately 4 GPa and 10 GPa, respectively. The synergistic strengthening mechanisms included solid solution, precipitation, grain refinement, TRIP, and dislocation strengthening. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |