|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||On the Phase Stability, Mechanical Properties, and Deformation Mechanisms of an Equiatomic CrFeNi Medium-entropy Alloy
||Mike Schneider, Guillaume Laplanche
|On-Site Speaker (Planned)
The CrFeNi medium-entropy alloy, due to its compositional simplicity and its single phase character, constitutes a missing link between binary and more complex engineering alloys such as austenitic stainless steels and Fe-based superalloys. In this 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. To reveal the active deformation mechanisms in CrFeNi, additional tensile tests were interrupted at different strains followed by transmission electron microscopy analyses. In all cases, deformation was accommodated by dislocation glide at low strains, whereas twinning was additionally triggered above a critical resolved shear stress. From these findings, the critical resolved shear stress for twinning in CrFeNi was determined to be roughly temperature independent and in good accordance with modeling predictions.
||High-Entropy Alloys, Mechanical Properties, Characterization