|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Lateral Variation in Multi-phase HEA Passive Films: Implications for Corrosion Resistant Alloy Design
||Samuel B. Inman, Peter Connors, Mark Wischhusen, Diego Ibarra Hoyos, Joseph Poon, Sean Agnew, John Scully
|On-Site Speaker (Planned)
||Samuel B. Inman
HEAs allow for new strategies to target passivity and resistance to aqueous corrosion. The improved the compositional homogeneity can promote the formation long-range ordered or disordered solid solution oxides between multiple passivating elements. However, formation of such species can be hindered by elemental partitioning from second phase. While previous work has shown depletion of passivating elements can promote localized corrosion, little work has been done to evaluate the effects of microstructural partitioning on local and global passive film chemistry. This work evaluates corrosion behavior and lateral variation the dual-phase Al0.3Cr0.5Fe2Mn0.25Mo0.15Ni1.5Ti0.3 passive film. Two distinct compositions are formed with defined lateral bounds matching the bulk microstructure. Thus, controlling microstructural partitioning and interface engineering may be effectively utilized as a tool to alter passive film chemistry, and by extension corrosion performance. The findings are discussed with respect to the lightweight low-cost Al-Cr-Fe-Mn-Mo-Ni-Ti system and extended to general corrosion resistant CCA design principals.
||Planned: Metallurgical and Materials Transactions