About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture
|
| Presentation Title |
Understanding Fatigue Crack Initiation and Growth in an Additively Manufactured Cu Based Alloy |
| Author(s) |
Aeriel D. Murphy-Leonard, Jiashi Miao, Nathan Heniken |
| On-Site Speaker (Planned) |
Aeriel D. Murphy-Leonard |
| Abstract Scope |
In this study a specifically designed methodology using scanning transmission electron microscopy, scanning electron microscopy, electron channeling contrast imaging and electron back scatter diffraction was employed to understand the mechanisms of fatigue crack initiation and growth in wire arc additive manufactured (WAAM) nickel-aluminum-bronze. Flat, rectangular dog bone specimens were extracted from the center of WAAM bar and then tested under tension-compression and tension-tension cyclic loading conditions (R= -0.3, 0.3, -0.15, 0.15, 0). The initial microstructure was composed of α-grains with nanoscale, spherical κIV precipitates distributed homogeneously throughout the matrix as well as interdendritic zones composed of incoherent κIII and κII second phase particles. Results showed that as the R-ratio decreased the fatigue life was reduced. Advanced characterization showed that planar slip led to extensive accumulation of dislocations at boundaries between the α-matrix and the interdendritic region. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Characterization |