About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
|
Presentation Title |
Neutron Diffraction Analysis of Microstructure and Residual Stresses in Lubricant-free AFSD AA7075 Repairs |
Author(s) |
Ning Zhu, Yan Chen, Ke An, Luke Brewer, Paul Allison, Brian Jordon |
On-Site Speaker (Planned) |
Ning Zhu |
Abstract Scope |
Additive friction stir deposition (AFSD) manufactures deposits below the melting temperature of the feedstock materials. The solid-state nature of AFSD promotes its application of structural restoration on worn or corroded heat-treatable aluminum alloys, as conventional fusion-based repairing techniques will induce solidification cracking and pores into the materials. However, the processing temperature during the AFSD, e.g., above 300 ºC, is still significantly higher than the conventional heat-treatment temperature at 120ºC of the AA7075-T6 feedstock material. The thermal cycles will coarsen the strengthening precipitates and likely generate residual stresses in the AFSD AA7075 repairs. This research utilizes the neutron beam line VULCAN at the oak ridge national laboratory to study the microstructural evolution and residual stress distribution in the lubricant-free AFSD AA7075 repairs. The neutron diffraction analysis demonstrated a decreased volume fraction of strengthening precipitates, and residual stresses comparable to the yield strength in the AFSD repairs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Characterization, Phase Transformations |