About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Orientation Dependence of the Effect of Short-range Ordering on the Plastic Deformation of a Medium Entropy Alloy |
Author(s) |
Ibrahim Karaman, Sezer Picak, Daniel Salas, Prasanth Singh, Matheus A Tunes, Yuriy I Chumlyakov, Duane D Johnson |
On-Site Speaker (Planned) |
Ibrahim Karaman |
Abstract Scope |
High entropy alloys (HEAs) offer a larger and richer design space than conventional alloys. Some HEAs exhibit high strength and ductility combinations, linked to the activation of various deformation modes triggered by low stacking fault energies (SFEs). However, a pressing question remains: Is the plasticity of HEAs governed only by SFE, or does atomic short-range order (SRO) play a role? To answer this, we investigated how SRO affects the deformation in single-crystalline NiCoCr. We demonstrated that by tuning the degree of SRO through aging at high temperatures, twinning density and strain-induced martensitic phase transformation can be significantly increased in the [110] and [111] orientations under tension, increasing the tensile ductility; yet, no increase was observed along the [001] orientation due to lack of TWinning-Induced Plasticity TWIP) or TRansformation-Induced Plasticity (TRIP), indicating a strong crystallographic orientation dependence. We find direct proof that SRO triggers a simultaneous TWIP and TRIP in NiCoCr. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |