|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Corrosion-resistant Nobility of AlxCoCrFeNi High-enthropy Alloys
||Yunzhu Shi, Liam Collins, Rui Feng, Bin Yang, Peter K. Liaw
|On-Site Speaker (Planned)
The multiple compositionally-equivalent high-entropy alloys (HEAs) have shown remarkable potential in structural and energy-related applications. The intrinsic chemical disorder of HEAs leads to a unique corrosion resistant property, which plays one of the key roles in the practical usages. Here we select AlxCoCrFeNi HEAs system to present a new basis for understanding the fundamental relationship between microstructures and corrosion properties through characterizing surface-electron activities, revealing that the complex phase types and distinctive chemical segregation increase the variation of electron work functions, which, therefore, weakens the corrosion-resistance ability of alloys. Moreover, the annealing process at 1,250℃ has a profound effect on enhancing the chemical disorder, decreasing the electron-activity variations among phases, and evidently improving the localized corrosion resistance. The present research provides an integrated experimental and theoretical approach that could be applied to meet the challenges of alloy design for novel corrosion-resistant HEAs.
||Planned: Supplemental Proceedings volume