| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
In Situ Measurement of Three-Dimensional Intergranular Stress Localizations and Grain Yielding Under Elastoplastic Axial-torsional Loading |
| Author(s) |
Yaozhong Zhang |
| On-Site Speaker (Planned) |
Yaozhong Zhang |
| Abstract Scope |
The three-dimensional grain-scale elastoplastic response of solid bar samples during non-proportional (NP) axial-torsional loading was investigated using in situ high energy diffraction microscopy (HEDM) and companion crystal plasticity finite element (CPFE) modeling. Important stress metrics were tracked for ~ 300 grains under two different loading conditions: (i) Torsion-dominated loading (low NP) and (ii) Tension-torsion loading (high NP) in equiatomic NiCoCr, a representative multicomponent face-centered cubic (FCC) alloy. NP boundary conditions led to a complex interplay between stress components resulting in grain yielding near the sample surface largely driven by shear stress, whereas internal grain yielding largely accommodated by axial stress. Overall, grain-resolved stress localization trends were well-captured by the CPFE model, although some discrepancies in magnitude occurred due to initial type II residual stress distributions which were overcome via the superposition of initial residual stress states onto CPFE grain-resolved data. |
| Proceedings Inclusion? |
Undecided |