|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Real-time Mapping of Local Dissolution Processes in AlxCoCrFeNi High-entropy Alloys
||Yunzhu Shi, Bin Yang, Liam Collins, Nina Balke, Peter K Liaw
|On-Site Speaker (Planned)
Multiple compositionally-equivalent high-entropy alloys (HEAs) are interesting for technological applications due to their promising corrosion resistance. The intrinsic random and homogeneous arrangement of elements in HEAs is expected to strongly influence the corrosion resistance. While the multi-phase microstructure and chemical segregations could lead to localized corrosion. In the present study, we employ in-situ electrochemical-atomic force microscopy (EC-AFM) to investigate the localized corrosion mechanism of the Al<SUB>x</SUB>CoCrFeNi HEAs. Topography changes of the samples on the micro/sub-micro scale are monitored in real-time at consecutively-applied anodizing potentials in a 3.5 weight percent (wt. %) NaCl solution. By increasing the Al content, the change of microstructures from homogeneous to heterogeneous states turns the process of local dissolution from pitting to selective corrosion. Overall, in-situ EC-AFM is a useful tool to explore details of the oxidation/dissolution behavior. The in-depth understanding of the local dissolution activity is important for the future design of high-performance HEAs.
||Planned: Supplemental Proceedings volume