| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Composition Tailoring for Avoidance of Crack-Inducing Liquid Miscibility Gap in Inconel 718 and GRCop-42 Joints |
| Author(s) |
Jakub Preis, Stephanie Lawson, Somayeh Pasebani |
| On-Site Speaker (Planned) |
Somayeh Pasebani |
| Abstract Scope |
Joining of high thermal conductivity Cu-based dispersion-strengthened alloys to high temperature tensile strength Ni-based superalloys is of interest in heat exchanging applications. However, when joined using liquid state processes, such joints have been shown to crack due to a liquid miscibility gap between Cu-rich and Cu-deprived mixtures. In this work, CALPHAD is utilized to map the development of a transition composition which avoids the liquid miscibility gap for GRCop-42 and Inconel 718 joints. The CALPHAD predictions are validated by arc melting to ensure the selected transition composition has a higher strength than GRCop-42. The developed transition composition is fabricated using laser directed energy deposition (LDED) and analyzed in terms of microstructural morphology, thermal conductivity, and microhardness. Process modeling is used to optimize LDED processing conditions and explore fluid flow at transition interface. The presented methodology serves as a template for development of transition compositions for other dissimilar metal systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Joining |