|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Insights into Deformation Induced Grain Boundary Migration in Ultrafine-grained Metals
||Oliver Renk, Pradipta Ghosh, Reinhard Pippan
|On-Site Speaker (Planned)
The increased fraction of grain boundaries makes nanocrystalline or ultrafine-grained materials prone for grain growth during deformation. The high stresses applied to these materials are often thought to be responsible for grain boundary migration. We present a study on UFG fcc and bcc metals, synthesized by high pressure torsion, and subjected to a strain path change (coldrolling). The initial UFG samples showed elongated grain structures. In order to understand the effect of stress on grain boundary migration, samples were rolled along different directions, with the long grain axis parallel to the rolling direction and in a second set of samples parallel to the normal direction. Depending on crystal structure and grain orientation with respect to the rolling direction, substantially different hardness and structural evolution with increasing rolling strain was observed. This indicates grain boundary migration in UFG materials to be not entirely driven by the applied stress as often suggested.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)