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 |
Effects of Molybdenum and Silicon Co-doping on Microstructures and Mechanical Properties of CoCrNi Medium Entropy Alloy |
Author(s) |
Sheng-Wei Chen, Chun-Hway Hsueh |
On-Site Speaker (Planned) |
Sheng-Wei Chen |
Abstract Scope |
A series of (CoCrNi)100-x-yMoxSiy medium entropy alloys (MEA) was processed using vacuum arc melting to improve the mechanical properties of CoCrNi MEA. The results showed that the additions of Mo and/or Si promoted strength enhancement with only slight ductility sacrifice due to solid solution strengthening, grain boundary strengthening and precipitation strengthening. The formation of σ phase Cr-Mo rich precipitates and χ phase Cr-Si-Mo rich precipitates could be attributed to the co-doping of Mo and Si in the FCC CoCrNi matrix. The hardness of FCC matrix, σ phase precipitates and χ phase precipitates measured by nanoindentation were approximately 4.3, 12.5, 14.4 GPa, respectively. In this study, the excellent strength-ductility combination was obtained through Mo and Si co-doping in the CoCrNi MEA due to the contribution of low stacking fault energy (SFE) from the doping elements. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, |