| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Temperature-Dependent Deformation Mechanisms in the FeCrNi Alloy Containing BCC Particles: Dislocation Cells and Deformation Twins |
| Author(s) |
Jin-Seob Kim, Jin-Kyung Kim |
| On-Site Speaker (Planned) |
Jin-Seob Kim |
| Abstract Scope |
The FCC-based FeCrNi equiatomic medium entropy alloy has been studied as a cost-effective alternative to the CoCrNi alloy. The FeCrNi alloy cold-rolled and annealed at 800 ℃ exhibited microstructures consisting of the FCC matrix and the Cr-rich BCC precipitates with equiaxed or rod morphologies. With increasing annealing time at 800 ℃, both the fraction and size of the BCC particles increased. Annealing-time-dependent mechanical properties at room temperature and cryogenic temperature (-150 ℃) were investigated. With increasing annealing time, strength decreased and ductility increased for room temperature tensile tests. Cryogenic tensile tests showed strength enhancement without ductility loss. In room temperature deformation, dislocation cell-like slip dominated the deformation mechanism with minor activation of deformation twins, whereas in cryogenic deformation, twin activity was increased. We discuss the effects of annealing time and deformation temperature on phase-specific deformation mechanisms and mechanical properties of the investigated materials. |