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 Grain Size on the Low-cycle Fatigue Behavior of CoCrNiFeMn High Entropy Alloy |
Author(s) |
Sezer Picak, Thomas Wegener , S. Vahid Sajadifar , Cesar Sobrero , Julia Richter , Hansoo Kim, Thomas Niendorf , Ibrahim Karaman |
On-Site Speaker (Planned) |
Sezer Picak |
Abstract Scope |
High Entropy Alloys (HEAs) such as CoCrFeMnNi are a new class of multi-component metallic materials. However, their relatively low yield strength level is a major drawback. In the present work, Equal Channel Angular Pressing (ECAP) was employed to improve the initial yield strength level of CoCrFeMnNi HEA. In light of envisaged fields in engineering, the HEA was also studied under cyclic loading as this might show different microstructural evolution as compared to quasi-static monotonic loading. To allow for meaningful comparison, both strain-controlled low cycle fatigue tests under fully reversed push-pull loading (R=-1) and quasi-static (tensile and compression) tests were conducted at room temperature. Very high tensile and compressive yield strength levels (1.1 GPa) and superior fatigue life were obtained after ECAP processing due to grain-refinement and high defect densities. Finally, the formation of cell structure in these kinds of alloys is, for the first time, rationalized by the Copley-Kear effect. |
Proceedings Inclusion? |
Undecided |