|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture: Developing Predictive Capabilities
||J-5: Evaluation of Heat-treated Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Plates Repaired via Additive Friction Stir-deposition
||Dustin Avery, Conner Cleek, Brandon Phillips, M Y Rekha, Ryan Kinser, Harish Rao, Paul Allison, Luke Brewer, James Brian Jordon
|On-Site Speaker (Planned)
Many aerospace alloys exhibit poor mechanical performance when subjected to fusion-based processing due to deleterious microstructural evolution during solidification. Additive Friction Stir Deposition (AFS-D), a relatively new solid-state additive manufacturing process, offers a potential solution for repairing these alloys. The present study elucidates the microstructural and mechanical properties of a damaged plate of aluminum alloy 7075-T651 (Al-Zn-Mg-Cu) additively repaired via AFS-D. Microstructural, tensile, and fatigue characteristics of wrought plate and heat-treated repairs were evaluated; notably, the heat-treated repair exhibited a yield and ultimate stress comparable to wrought, consistent with the recovery of the ƞ’ and ƞ strengthening phases observed via scanning and transmission electron microscopy, but exhibited a reduction in fatigue life attributed to fisheye defects stemming from carbon impurities introduced into the AFS-D process. Process-structure-property fatigue mechanisms were quantified by implementing a microstructure-sensitive fatigue life model for both the AA7075 wrought plate and heat-treated repair material.
||Mechanical Properties, Additive Manufacturing, Aluminum