| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VI
|
| Presentation Title |
Precipitation Hardening in BCC Multilayer Thin Films |
| Author(s) |
Yailuth Loaiza Lopera, David Bahr |
| On-Site Speaker (Planned) |
Yailuth Loaiza Lopera |
| Abstract Scope |
Multilayered Nb-Cr/Cu thin films were deposited by magnetron sputtering contain approximately 20 layer of 25 nm average thickness per layer, with a nominal Cu concentration of 5% in the Cr layer. The films were then annealed at 573K for 1 to 8 hours, and indentation at room temperature post-annealing demonstrated a typical precipitation hardening behavior. A peak hardness of 10GPa, 43% higher than the as-deposited film, and a modulus of 180 GPa was observed at 1.5 hours annealing. Combinations of SEM, TEM, and XRD were used to characterize grain sizes and phases. The observed behavior and characterization results suggest that both solid solution and precipitation hardening are responsible for the changes in mechanical properties. Elevated temperature indentation post-annealing demonstrated the strengthening from Cu precipitation in the hard Cr layer remains effect at moderately elevated temperatures. |
| Proceedings Inclusion? |
Planned: |