| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Opportunities and Applications of Solid-State Additive Manufacturing Processes
|
| Presentation Title |
Dissimilar Material Multilayer Deposition Using Additive Friction Stir Deposition |
| Author(s) |
Nikhil Gotawala, Greg D Hahn, Hang Z Yu |
| On-Site Speaker (Planned) |
Nikhil Gotawala |
| Abstract Scope |
Additive friction stir deposition is a solid-state additive manufacturing process known for its capability of microstructure refinement and resulting wrought-like mechanical properties. The main aim of this work is to examine material flow, morphology formation, and microstructural evolution in multilayer deposition of dissimilar Al alloys (AA2024/AA6061). Characterization based on X-ray computed tomography and scanning electron microscopy shows that AA2024 and AA6061 layers are not uniformly distributed in three dimensions due to the asymmetrical material flow path convoluted with bi-directional layer deposition. The microstructure analysis reveals that continuous dynamic recrystallization is the main mechanism for grain refinement for both materials. The average grain size of AA2024 layers is lower than AA6061 layers as continuous dynamic recrystallization is more complete in the former. B/ B̅ and C types are the primary shear texture formed in both layers because of the influence of tool shoulder during deposition. |