| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
Mechanical Properties and Deformation Mechanism of Cast and Additively Manufactured NiAl-CrMo In-Situ Composites |
| Author(s) |
Jan Vollhüter, Katharina Titz, Benjamin Wahlmann, Carolin Körner, Steffen Neumeier, Mathias Göken |
| On-Site Speaker (Planned) |
Jan Vollhüter |
| Abstract Scope |
The NiAl B2 intermetallic phase is promising for high-temperature applications due to its high melting point, low density, thermal conductivity, and oxidation resistance. However, it lacks high-temperature strength and room temperature fracture toughness. The addition of Cr and Mo results in a eutectic alloy with enhanced mechanical properties. For additive manufacturing, a new alloy composition (Ni30.6Al36Cr31.4Mo2) has been developed, featuring a significantly reduced solidification interval to achieve a perfect eutectic microstructure.
In specimens manufactured via electron beam powder bed fusion (PBF-EB), a nanostructured microstructure with a high interface density is formed, resulting in improved yield strength across a wide temperature range compared to traditionally cast NiAl-CrMo composites. Under creep conditions, PBF-EB specimens with their significantly altered microstructure exhibit different deformation mechanisms compared to cast specimens. While cast specimens primarily deform through subgrain formation, PBF-EB specimens transition from a dislocation-dominated mechanism at higher loads to a diffusion-driven mechanism at lower loads. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Characterization |