About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Operando X-ray Diffraction Reveals Solidification Pathway of High Entropy Alloys with Different Degrees of Metastability |
Author(s) |
Akane Wakai, Amlan Das, Atieh Moridi |
On-Site Speaker (Planned) |
Atieh Moridi |
Abstract Scope |
High entropy alloys (HEAs) consisting of FeMnCoCr (Fe80-xMnxCo10Cr10 at%, x = 35, 40, and 45) enable a systematic investigation of the effect of phase metastability on the solidification pathway in additive manufacturing (AM). Operando X-ray diffraction conducted at Cornell High Energy Synchrotron Source (CHESS) illuminates the sequence of phase transformations during the rapid solidification inherent to AM. Of the three compositions studied, a metastable martensitic phase is detected only in Fe45Mn35Co10Cr10 (HEA3), which has the lowest stacking fault energy compared to the other two compositions (Fe35Mn45Co10Cr10, HEA1, and Fe40Mn40Co10Cr10, HEA2). The subsequent phase transformation into the stable austenitic phase induces recrystallization, resulting in notable grain refinement and transition to a more equiaxed microstructure in HEA3 compared to HEA1 and HEA2. These findings provide insight into the solidification fundamentals of these HEAs with varying phase metastability and offer us a new tool to engineer the microstructures during AM.
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Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, High-Entropy Alloys, Solidification |