|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Dealloying Induced Stress Corrosion Cracking
||Karl Sieradzki, Nilesh Badwe, Xiying Chen, Erin Karasz, Ariana Tse
|On-Site Speaker (Planned)
We discuss results from a series of experiments on single crystal and polycrystalline Ag-Au alloys aimed at examining the film induced cleavage mechanism of stress corrosion cracking. We chose to examine the behavior of these alloys since dissolution in this system has been thoroughly studied, as have the mechanical properties of the nanoporous gold (NPG) structures that form upon dealloying. Additionally, for noble metal alloys such Ag-Au in acid, the electrochemical potential at which SCC occurs is ~ 800 mV more positive than the potential at which hydronium or water can be reduced. In order to separate dissolution related crack advance from mechanical effects we examined dynamic fracture in NPG and performed crack injection experiments. We use high-speed (1M f/s) photography, aberration-corrected STEM, EBSD, SEM and statistically based arguments to analyze our results.
||Planned: Supplemental Proceedings volume