| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Surface Engineering II
|
| Presentation Title |
Characterization of Precipitates Evolution in Laser Assisted Cold Spray of AA7050 and AA7075 |
| Author(s) |
Ning Zhu, Luke N Brewer |
| On-Site Speaker (Planned) |
Ning Zhu |
| Abstract Scope |
This presentation describes the evolution of precipitates during laser assisted cold spray (LACS) of AA7050 and AA7075. LACS improves the deposition efficiency compared to conventional cold spray by thermal softening of the substrate using in situ laser heating. The mechanical properties of AA7xxx alloys strongly depend on the size distribution of metastable precipitates. As such, the thermal profiles during deposition are key to strengthening the material without overaging it. AA7050 and AA7075 materials were deposited using cold spray both with and without laser heating. Electron microscopy is being applied to characterize the size distribution of precipitates in the starting powders, cold spray deposits and LACS deposits as a function of heat input from the laser. As the laser heat input increases, we have observed coarsening of both η phase precipitates and the aluminum grain size. Laser heat treatment also impacts the precipitate distribution in the substrate for larger heat inputs. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |