|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Insights into Deformation Induced Grain Boundary Migration in Ultrafine-grained Metals from a Strain Path Change – Does
Texture Play a Role?
||Oliver Renk, Pradipta Ghosh, Reinhard Pippan
|On-Site Speaker (Planned)
Grain boundary and triple junction migration is frequently observed during plastic deformation of nanostructured materials. These processes occur even at low homologous temperatures, suggesting mechanical driving forces. However, if the applied stress or the strain is crucial for inducing migration is still controversially discussed. We present a study on UFG copper synthesized by high pressure torsion and subjected further to cold rolling. The initial UFG samples showed slightly elongated grain structures with random misorientation distribution and no preferred rotation axis of the boundaries. To understand the effect of stress on grain boundary migration, samples from the same HPT disk were rolled along different directions.
We will show that, depending on the starting texture of the rolled sheets, substantially different hardness and structural evolution with increasing rolling strain can be observed. This indicates grain boundary migration in UFG materials to be not entirely driven by the applied stress as often suggested.
||Planned: Supplemental Proceedings volume