|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Modulating Stability and Strength in Nanocrystalline FCC Metals: The Effects of Microstructure, Composition and Interfacial Character
||Jacob Gruber, Garritt Tucker
|On-Site Speaker (Planned)
Nanocrystalline materials possess many useful physical properties owing in part to their small average grain size and the associated increasing role interfaces play in the overall materials response. However, retaining a stable microstructure during thermomechanical processes has continuously plagued wider application of these materials. During deformation, for example, the microstructure is altered as strain accommodation processes are activated. In this work, the competition of deformation mechanisms in nanocrystalline alloys is quantified using atomistic modeling. This competition between mechanisms affects microscopic properties, and transitions between dislocation-mediated and interface-mediated is discussed in terms of stability. The balance between deformation mechanisms can be perturbed by modifying interfaces, which in turn modulates the grain sizes at which transitions occur. We probe the effect of global microstructure, alloying, and the local atomic structure at grain boundaries on the mechanistic transitions. These results potentially demonstrate new pathways towards the fine control of properties in nanocrystalline materials.
||Planned: Supplemental Proceedings volume