| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
N-39: Pressure Effects during High Pressure Torsion of Dilute Magnesium-Yttrium |
| Author(s) |
Christian Roach, Kiran Solanki, Suveen Nigel Mathaudhu |
| On-Site Speaker (Planned) |
Christian Roach |
| Abstract Scope |
High pressure torsion (HPT) can refine most metals to the nanocrystalline regime but magnesium’s high recovery rate limits the minimum achievable grain size. HPT is typically performed at the highest pressure available, since this increases the metastable dislocation density which in turn is expected to result in finer grains. However, materials with high recovery rates show increased static recovery at higher dislocation density. A reduction in processing pressure limits the number of dislocations that can be introduced and may minimize this post-processing static recovery. Yttrium reduces basal texture and improves plasticity through activation of cross-slip, thus magnesium-yttrium (3 wt% ) was processed at pressures of 1, 3, & 5 GPa through five rotations in order to unravel the effects of processing pressure on microstructural refinement. Electron microscopy points to increased static recovery with increased pressure while micro-tensile testing shows reduced elongation to failure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |