About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Elevated-temperature Creep Properties and Deformation Mechanisms in a CrMnFeCoNi High-entropy Alloy |
Author(s) |
Mingwei Zhang, Easo George, Jeffery Gibeling |
On-Site Speaker (Planned) |
Mingwei Zhang |
Abstract Scope |
Despite the abundance of cryogenic and room temperature studies of FCC high-entropy alloys (HEAs), their elevated-temperature deformation mechanisms have not been explored in detail. In the present study, we report on the results from steady state and stress reduction creep experiments under various initial and reduced stresses. A stress exponent of 3.7 was obtained for steady state creep. The activation area for deformation of CrMnFeCoNi was measured to be approximately 100 b^2 and to decrease with increasing applied stress, indicating the presence of both concentrated solid solution and forest dislocation control. Quantitative separation of the two mechanisms was carried out using a Haasen plot, which shows that creep in CrMnFeCoNi relies heavily on thermal activation and the majority of creep strength comes from solid solution hardening. The analysis reveals that steady-state creep deformation of CrMnFeCoNi can be adequately described by existing concentrated solid solution hardening and forest dislocation hardening models. |
Proceedings Inclusion? |
Undecided |