| Abstract Scope |
Multi-principal element alloys (MPEAs) comprise a large, flexible compositional space that enables tuning of their chemistry, structure, and properties. This superior characteristic can also be harnessed in developing surface-enhancement strategies to further improve their wear and corrosion resistance. This work focuses on the design of transition- and refractory-MPEAs, and the formation of a nitride surface layer and a compositionally graded interstitial solid solution layer by nitriding. Preliminary experiments involve gas nitriding nitride-forming pure metals, including Hf, Mo, Nb, Ta, Ti, and Zr, to investigate the influence of temperature, time, and nitriding potential on the growth kinetics of the nitrided zone. The results serve as a reference to a computational thermodynamics screening process to identify promising MPEAs for further study. This approach aims to efficiently test a wide range of compositions, and narrow down feasible ones that provide high strength and good surface durability after nitriding. |