|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Corrosion of Single- and Multi-phase High Entropy Alloys
||Sarita Sahu, Tianshu Li, Anup Panindre, Babu Viswanathan, Christopher Taylor, Angela Gerard, John Scully, Pin Lu, Gerald S. Frankel
|On-Site Speaker (Planned)
||Gerald S. Frankel
The corrosion behavior of several high entropy alloys (HEAs) was studied. A single phase NiCrFeRuMoW HEA exhibited remarkable corrosion resistance, even in concentrated HCl solution, either in the as-cast or solutionized condition. Heat treatment of the solutionized HEA to precipitate second phases resulted in a large increase in hardness, and only a slight degradation in corrosion resistance. Details of the HEA microstructure and the influence on corrosion resistance will be presented. A series of single phase NiFeMnCoCr HEAs with Cr composition varying from 22 to 6%, balanced by changes in the Mn and Co contents, were also studied. Even the alloy with 6% Cr exhibited passivity and pitting in NaCl solution, behaving like a Ni-based alloy, even though the Ni content was only 38%. The pits in alloys with 6, 10, or 14%Cr were crystallographic, even when grown at high potentials, reflecting difficulty in precipitating a salt film.