| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Agile Additive Manufacturing by Employing Breakthrough Functionalities
|
| Presentation Title |
Negative Thermal Expansion Behaviour of Metallic Metamaterials Produced via Multi-material L-PBF |
| Author(s) |
Isabel Beatriz Prestes, Erhard Buchmann, Philipp Höfer, Eric Jägle |
| On-Site Speaker (Planned) |
Isabel Beatriz Prestes |
| Abstract Scope |
Most of the materials found in nature present a positive CTE. However, components that require high dimensional accuracy at large temperature variations would benefit from the use of materials with extremely low or negative CTE. Metamaterials proposed in the literature should be able to achieve negative thermal expansion by combining two materials with large CTE difference in a specific lattice structure. Due to their complex geometry, AM is the most suitable process to fabricate them. In this work, negative-CTE metamaterials made out an Invar + IN718 combination were studied. The specimens were printed in an L-PBF machine equipped with a multi-material Aerosint recoater. Different scanning strategies were studied in order to improve the quality of the interface between materials, which was analysed by SEM and by mechanical tests. The CTE of different geometries before and after stress relief were evaluated by dilatometry. Finally, the results were compared with FEM simulations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Other |