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 |
ON DEMAND: On the Phase Stability, Mechanical Properties, and Deformation Mechanisms of the Equiatomic CrFeNi Medium-entropy Alloy |
Author(s) |
Mike Schneider, Guillaume Laplanche |
On-Site Speaker (Planned) |
Mike Schneider |
Abstract Scope |
Due to its compositional simplicity and single-phase character, the CrFeNi medium entropy alloy constitutes a missing link between binary and more complex engineering alloys such as austenitic stainless steels and Fe-based superalloys. In the present study, heat treatments at various temperatures revealed that CrFeNi forms a stable FCC solid solution above ~1250 K. Compression and tensile tests were carried out for recrystallized FCC microstructures with different grain sizes between 77 K and 873 K. Additionally, tensile tests interrupted at pre-defined levels of plastic strain in combination with transmission electron microscopy were performed to reveal the active deformation mechanisms. While, in the early stages of plasticity, planar glide of dislocations dominates, deformation twinning acts as an additional mechanism as deformation progresses. From these findings, the critical resolved shear stress for twinning in CrFeNi was determined to be almost independent of temperature in accordance with modeling predictions. |
Proceedings Inclusion? |
Undecided |