|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Correlating Dislocation Configurations to Deformation Behavior in Cyclically Deformed Additive Manufactured IN718
||Yung Suk Yoo, Todd Book, Michael Sangid, Josh Kacher
|On-Site Speaker (Planned)
Additive manufactured structural materials show great promise in rapid machining of complex parts, but their long-term deformation behavior remains poorly understood. This study focuses on correlating deformation analysis across length scales using digital image correlation (DIC), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) in IN718. DIC strain measurements coupled with EBSD-based orientation mapping were used to identify regions of interest such as high dislocation concentrations and deformation band interactions with grain boundaries in the cyclically deformed samples. Focused ion-beam (FIB) machining facilitated site-specific sample fabrication for in-depth dislocation characterization. Special emphasis was given to dislocation configurations found near twin boundaries as previous experiments have identified them as preferred fatigue crack nucleation sites. Discussion will focus on insights into the mechanics of crack formation as well as the effectiveness of coupling macroscale strain mapping techniques with local dislocation analysis to understand complex deformation processes.