|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-161: Grain Growth in Nanostructured Materials during Cyclic Loading: Is the Description Complete?
||Marlene Kapp, Oliver Renk, Thomas Leitner, Bo Yang, Reinhard Pippan
|On-Site Speaker (Planned)
Grain coarsening during cyclic loading of ultrafine-grained or nanocrystalline structures has been identified to deteriorate the fatigue performance, especially when tested with high plastic strain amplitudes. Not only the understanding of basic mechanisms of the coarsening process but also the impact of the crystallographic orientation and grain boundary type is still at its infancy. We will present results obtained from a new experimental approach to solve these questions. Using cyclic high pressure torsion enables to study the coarsening process at different temperatures up to infinite lifetime, thus the coarsening process can be captured without failure of the sample. We will show, that grain coarsening stops when a certain equilibrium grain size, depending on the applied strain amplitude, is reached. Texture analyses clearly show similarities with cyclic torsion loading of coarse grained samples. The results indicate that the applied strain and not the stress are responsible for the growth process.
||Planned: Supplemental Proceedings volume