|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||What Controls Corrosion and Passivation of Compositionally Complex Alloys?
||John R Scully, Samuel B. Inman, Junsoo Han, Debashish Sur, Angela Y Gerard
|On-Site Speaker (Planned)
||John R Scully
Multi-principal element alloys (MPEAs) offer the possibility of many degrees of freedom in the choice of alloying elements to produce either single phase solid solutions or complex multiphase microstructures. Mastery of element selection and alloy compositions can enable novel combinations of properties unobtainable in traditional alloys. From the aqueous corrosion perspective, optimization of phase stability, control of heterogeneities, passive film identity and its protectiveness, as well as substrate properties such as metal-metal bond strength and activation energies associated with dissolution, are controlling factors in corrosion resistance. The quest for superior properties based on well-informed choice of alloying elements is suggested as a path forward guiding MPEA formulations for corrosion performance. However, gaps in fundamental knowledge exist regarding (a) the specific functions of each element, (b) accounting for elements in unusual combinations, and (c) the formation of complex protective oxides. These issues currently hold back progress in optimization of corrosion properties.