|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Fatigue Strength Scaling and Deformation at the Nanoscale – Nanotwinned and Nanocrystalline Metals
||Nathan Heckman, Christopher M Barr, Timothy A Furnish, Khalid Hattar, Stephen M Foiles, Fadi Abdeljawad, Christoph Eberl, Andrea M Hodge, Brad L Boyce
|On-Site Speaker (Planned)
Nanotwinned and nanocrystalline metals have been of much interest lately due to their relatively high strengths and improved fatigue properties. Nanotwinned and nanocrystalline copper alloys and nickel alloys are compared in this study, where the high cycle regime fatigue strengths of the materials are observed to scale differently with tensile strength for each microstructure. This is correlated with a difference in deformation mechanisms: in nanotwinned alloys, localized detwinning leads to intergranular crack formation, while in nanocrytalline alloys, abnormal grain growth leads to fatigue crack initiation. The influence of microstructure and deformation mechanism on fatigue strength scaling is presented in this work. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and 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.
||Planned: Supplemental Proceedings volume