About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
Nb Solubility in Cu Grain Boundaries |
Author(s) |
Emmeline Sheu, Jon Kevin Baldwin, Darrick J. Williams, Michael J Demkowicz |
On-Site Speaker (Planned) |
Emmeline Sheu |
Abstract Scope |
The equilibrium solubility of niobium(Nb) in copper(Cu) is miniscule. We present experimental evidence that Nb nevertheless has significant solubility in certain Cu grain boundaries (GBs). We synthesize a tri-layer sample consisting of a Cu layer deposited on a Nb substrate and a molybdenum (Mo) layer deposited on the Cu. After a brief, high-temperature anneal, we observe Nb in solution within the Mo layer immediately adjacent to certain GBs in the Cu layer. Upon further annealing, the Nb content in the Mo increases, eventually forming a continuous layer of Mo-Nb solid solution that increases in thickness with continued annealing. We conclude that Nb is permeating through Cu GBs and mixing with the Mo. The permeability of Nb through Cu GBs is evidence of Nb solubility within those GBs. Notably, some Cu GBs exhibit no Nb permeability, demonstrating that Nb solubility in Cu GBs depend on the crystallographic character of the GBs. |
Proceedings Inclusion? |
Planned: |