About this Abstract |
Meeting |
TMS Specialty Congress 2025
|
Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
Presentation Title |
On the Thermal Aging of the Nanoporous Structure of Sintered Ag on a Cu Substrate |
Author(s) |
Xavier Milhet, Jerome Colin, Kokouvi Happy N'Touaglo, Adine Nait Ali, Loic Signor |
On-Site Speaker (Planned) |
Xavier Milhet |
Abstract Scope |
As power modules are a complex assembly of different materials, all of them having different coefficients of thermal expansion, a fine evaluation of the evolution of the materials and interfaces is necessary. In this work, time resolved evolution (4D) of the nanoporous microstructure of sintered Ag (s-Ag) and sintered Ag on Cu (s-Ag/Cu) during thermal aging was monitored at high temperature using in-situ X-ray nanotomography. For both types of specimen, the density of S-Ag remains constant, the evolution is driven by the bigger pores and the pore growth follows the Ostwald ripening mechanism. Faster kinetics of growth is observed for s-Ag/Cu before deviating from Ostwald ripening after a critical time. Furthermore, complex evolutions in small pores clusters can be observed in both type of specimens. Those behaviors are discussed based on diffusion mechanisms in relation with a competition between local stresses relaxation and surface energy during diffusion. |
Proceedings Inclusion? |
Undecided |