|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
||Microstructure Evolution and Mechanical Behavior of Ni-NiAl Functionally Integrated Materials (FIMs) Processed via Directed Energy Deposition (DED)
||Xin Wang, Baolong Zheng, Benjamin E. MacDonald, Calvin H. Belcher, Penghui Cao, Lorenzo Valdevit, Enrique J. Lavernia, Julie M. Schoenung
|On-Site Speaker (Planned)
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.
||Additive Manufacturing, Powder Materials, High-Temperature Materials