About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Effect of Precipitation on Fatigue Crack Growth and Cyclic Deformation in Additively Manufactured Nickel Aluminum-Bronze |
| Author(s) |
Nathan Heniken, Jiashi Miao, Veronika Mazanova, Aeriel Murphy-Leonard |
| On-Site Speaker (Planned) |
Nathan Heniken |
| Abstract Scope |
The current study investigates how microstructure and precipitation influence deformation and damage development in a wire-arc additively manufactured (WAAM) nickel aluminum-bronze (NAB) alloy. NAB is characterized by a complex microstructure and composition, capable of forming various second-phase particles known as κ-phases during processing or subsequent heat treatments. Flat rectangular specimens shaped as dog bone and compact-tension geometries were machined from WAAM bars and subjected to load-controlled cyclic loading in tension-compression and tension-tension conditions, as well as monotonic tension. A unique methodology combining electron microscopy (scanning, transmission), electron channeling contrast imaging (ECCI), and electron back scatter diffraction (EBSD) with in-SEM and ex-situ loading was employed to understand dislocation interactions during fatigue. Under both loading conditions, planar dislocation slip was prevalent throughout grains leading to the formation of persistent slip bands. However, under cyclic conditions, cross-slip was observed in some grains. |