About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Facile Liquid Metal Infiltration of Ag in Invar-Cu Composites to Improve Thermal Conductivity |
| Author(s) |
Haobo Wang, Jerrold A. Floro |
| On-Site Speaker (Planned) |
Jerrold A. Floro |
| Abstract Scope |
We exploit liquid metal infiltration to selectively replace one phase of a prior two-phase solidification microstructure, as a means to improving thermal transport properties. Invar-Cu composites were formed either by arc melting or laser powder bed fusion (LPBF). Solidification into the ternary miscibility gap produces the Invar dendrites that reduce thermal expansion, while interdendritic Cu improves thermal conductivity. Nonetheless, significant mutual solubility in each phase limits the thermal transport. We selectively replace the Cu with Ag, with much higher purity, by encasing the Invar-Cu in molten Ag. The Ag dissolves the Cu interdendritic channels and can replace Cu on mm lengthscales in just a few minutes in arc-melted Invar-Cu. For LPBF composites, while full Ag penetration occurs along grain boundaries, infiltration along the quasi-1D interdendritic channels is limited by a Rayleigh instability. Stable infiltration obeys a simple kinetic model. Support from the II-VI/Coherent Foundation is gratefully acknowledged. |
| Proceedings Inclusion? |
Planned: |