About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Effect of Short-range Ordering on the Plastic Deformation of NiCoCr Medium Entropy Alloy |
Author(s) |
Sezer Picak, Prashant Singh, Daniel M. Salas, Yury Chumlyakov, Duane Johnson, Raymundo Arroyave , Ibrahim Karaman |
On-Site Speaker (Planned) |
Sezer Picak |
Abstract Scope |
Medium- and high-entropy alloys (M/HEAs) exhibit an outstanding combination of high strength and ductility, which has been linked to the activation of various deformation modes triggered by low-energy stacking faults. However, the question remains: is the plasticity of M/HEAs governed only by SFE, or does short-range ordering (SRO) play a role? To answer this question, we investigated the effect of SRO on the plastic deformation in single crystalline NiCoCr MEA. We demonstrated that SRO promotes twinning- and transformation-induced plasticity, depending on the crystallographic orientation of the crystals. We also discovered a new hierarchical strain induced phase transformation sequence (fcc→hcp→D019) at room temperature, which was attributed to a weaker degree of SRO in the hcp phase based on novel density-functional theory methods. By controlling the degree of SRO through aging at high temperatures, the level of twinning and strain-induced phase transformation has been increased, further enhancing the ductility levels in NiCoCr. |
Proceedings Inclusion? |
Undecided |