| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
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| Presentation Title |
Microstructure Evolution and Mechanical Behavior of Ni-NiAl Functionally Integrated Materials (FIMs) Processed via Directed Energy Deposition (DED) |
| Author(s) |
Xin Wang, Baolong Zheng, Benjamin E. MacDonald, Calvin H. Belcher, Penghui Cao, Lorenzo Valdevit, Enrique J. Lavernia, Julie M. Schoenung |
| On-Site Speaker (Planned) |
Xin Wang |
| Abstract Scope |
Ni-Al intermetallic systems are attractive materials for high-temperature structural applications due to their high strength, but exhibit limited ductility. Recently, directed energy deposition (DED) techniques have demonstrated the ability to control local chemistry in a build through the co-deposition of dissimilar powder feedstocks, providing a approach to spatially tune chemistry and mechanical behavior. In this talk, two powder feedstocks, Ni and pre-alloyed NiAl, are co-deposited in the DED process to fabricate heterogeneous samples with site-specific structural modulations named functionally integrated materials (FIMs). Compositional transitions from Ni to NiAl are obtained to assess the effective mixing of the two feedstock materials during DED. The non-equilibrium microstructural evolution, including the phase formation and compositional variations, are investigated using SEM/EDS, XRD and TEM techniques. The mechanical properties are evaluated as a function of position along with the transition. The experimental results are also compared to the predictions of phase stability calculated through CALPHAD. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, High-Temperature Materials |