| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Watching High-cycle Fatigue in Nanocrystalline Pt and Pt-Au |
| Author(s) |
Nathan M. Heckman, Christopher M. Barr, Khalid Hattar, David P. Adams, Timothy A. Furnish, Brad L. Boyce |
| On-Site Speaker (Planned) |
Nathan M. Heckman |
| Abstract Scope |
High-cycle fatigue of nanocrystalline Pt and Pt-Au is investigated through automated, interrupted scanning electron microscopy experiments. Topographical evolution as well as crack formation and propagation are observed at a notch throughout the entire fatigue life of microns thick samples to understand the deformation process, and the role that mechanisms such as abnormal grain growth and compositional crack arrest play in each of these materials. Structures that lead to the eventual failure of the materials are observed as early as 1% of the total life, and the complete transformation of these structures is seen over the fatigue lifetime. Post-mortem transmission electron microscopy characterization reveals the specific microstructural transformations occurring during deformation. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |