| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
|
| Presentation Title |
The Influence of Substantial Intragranular Orientation Gradients on the Micromechanical Response of Heavily-Worked Material |
| Author(s) |
Karthik Shankar, Meddelin Setiawan, Katherine S Shanks, Matthew Krug, Matt Kasemer, Darren C Pagan |
| On-Site Speaker (Planned) |
Matt Kasemer |
| Abstract Scope |
We examine the role of relatively large amounts of intragranular lattice misorientation through 3D crystal plasticity simulations of forged Al-7085-T7452. We utilize near-field high energy X-ray diffraction microscopy (HEDM) to measure 3D spatial orientation fields, and employ a novel reconstruction method that utilizes grain orientation envelopes measured using far-field HEDM to enable reconstruction of grains with intragranular orientation spreads greater than 10deg. We construct two primary virtual polycrystalline specimens for use in simulations to assess the effect of appreciable intragranular misorientation on the predicted deformation response: the first, a faithful representation of the HEDM reconstruction, the second, a homogenized structure with no intragranular misorientation. We find significant differences in the predicted deformation mechanism activation, distribution of stress, and distribution of plastic strain between simulations containing intragranular misorientation and those with homogenized orientations. |