| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Invar-Ag Microcomposites Formed by Ag Dendritic/Cellular Infiltration of pre-Cast or pre-Additively Manufactured Invar-Cu |
| Author(s) |
Haobo Wang, Prosenjit Biswas, Ji Ma, Jerrold Floro |
| On-Site Speaker (Planned) |
Haobo Wang |
| Abstract Scope |
This research aims to integrate Invar's low thermal expansion with Ag/Cu's high thermal conductivity by assembling a primary Invar matrix with a percolating Cu or Ag network. We have shown that casting or additive manufacturing (AM) of Invar-Cu successfully forms Invar dendrites or cells with a continuous interdendritic Cu network. The Invar-Cu composite properties are good but are limited by mutual solubility. Invar-Ag has much lower mutual miscibility, but solidification approaches fail due to liquid-phase immiscibility. We instead cast Invar-Cu with the desired microstructure, and then replace the interdendritic Cu with Ag via liquid-phase infiltration. Successful infiltration of Ag over mm lengthscales into arc-melted Invar-Cu precursors significantly enhanced thermal conductivity. Infiltration is more challenging in AM-built Invar-Cu due to much finer microstructure. We will discuss infiltration mechanisms, length-scale limitations, microstructure and resultant thermal performance of Invar-Ag composites, compared with Invar-Cu precursors. Support by the Coherent II-VI Foundation is gratefully acknowledged. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Process Technology, Solidification |