Computational design and initial corrosion assessment of a series of non-equimolar high entropy alloys
By Lu, Pin; Saal, James E.; Olson, Gregory B.; Li, Tianshu; Sahu, Sarita; Swanson, Orion J.; Frankel, G. S.; Gerard, Angela Y.; Scully, John R.
Published in Scripta Materialia
2019
Abstract
The integrated computational materials engineering approach has been employed to design a series of four single-phase non-equimolar high entropy alloys (HEAs) with systematically varied compositions (Ni38Fe20CrxMn21–0.5xCo21–0.5x with x = 6, 10, 14, and 22) and corrosion behavior. The HEAs were successfully designed, synthesized and confirmed to possess a single-phase FCC structure. Preliminary electrochemical corrosion characterization was conducted to gain fundamental understanding of the effects of HEA composition on corrosion resistance, which will be utilized to develop mechanistic corrosion models that enable the optimal design of corrosion resistant HEA. HEA containing 6 at.% Cr showed indications of passivity at a relatively low Cr content.