|About this Abstract
|Materials Science & Technology 2020
|Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales II
|Characterization of 3-D Slip Fields in Deforming Polycrystals
|Darren C. Pagan, Kelly E Nygren, Matthew Miller
|On-Site Speaker (Planned)
|Darren C. Pagan
The interconnecting interactions of crystallographic slip systems across ensembles of grains have been posited to be a critical factor in stress localization and subsequent nucleation of damage, especially during the dwell fatigue process in titanium alloys. To test these hypotheses, quantitative methods are needed to characterize slip activity in-situ in the bulk of deforming polycrystals. Here we present a new methodology that combines measurements of grain average stresses and spatially-resolved lattice orientation fields gathered using high-energy X-ray diffraction microscopy (HEDM) with crystal plasticity kinematics to reconstruct full 3-D slip activity fields at micron-scale resolutions. The utility of the method will be demonstrated through analysis of slip activity in Ti-7Al deformed under uniaxial tension with a focus on networks of slip developing through the deformed polycrystal.