| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development II
|
| Presentation Title |
Nano-structured NiAl-Cr(Mo) In-situ Composites Processed by Additive Manufacturing |
| Author(s) |
Andreas Foerner, Steffen Neumeier, Abdullah Jamjoom, Carolin Körner, Mathias Göken |
| On-Site Speaker (Planned) |
Andreas Foerner |
| Abstract Scope |
NiAl-Cr and NiAl-Cr(Mo) eutectic in-situ composites are promising high temperature materials due to a high melting point, excellent oxidation behavior and their low density. To enhance the poor room temperature fracture toughness of these composites, high cooling rates are beneficial to obtain fine cellular-lamellar structures, which can be achieved by additive manufacturing. The influence of SEBM process parameters on the microstructure and the mechanical properties of NiAlCr(Mo) were analyzed. In this study the investigations reveal a very high hardness of the composites due to the fine microstructure according to Hall-Petch strengthening. The eutectic microstructure is required to get good high temperature strength and creep properties. The fracture toughness was determined by microcantilever bending tests and fracture surfaces were analyzed to find toughness increasing mechanisms like crack bridging, renucleation or deflection at NiAl-Cr(Mo) interfaces. The research shows that SEBM is suitable to process NiAl-Cr(Mo) in-situ composites with promising mechanical properties. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |