About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond II
|
Presentation Title |
Surface Enhancement of Multi-principal Element Alloys by Gas Nitriding |
Author(s) |
Yu-Hsuan Lin, David Poerschke |
On-Site Speaker (Planned) |
Yu-Hsuan Lin |
Abstract Scope |
The large and flexible compositional space of multi-principal element alloys (MPEAs) provides new opportunities to tune alloy chemistry for better properties. In addition to optimizing the bulk properties, this superior characteristic also enables the development of new surface enhancement strategies for improved wear and corrosion resistance. This work focuses on devising strategies to design transition- and refractory-metal MPEAs for the formation of multi-principal element nitride coatings and graded interstitially-hardened structures with desired microstructures and properties via direct alloy conversion. Building on the insights from the study of growth kinetics and properties of the nitrided zone for nitride-forming pure metals including Hf, Mo, Nb, Ta, Ti, and Zr, computational thermodynamics screening was used in conjunction with combinatorial MPEA fabrication to identify promising alloy compositions. This combined computational-experimental approach aims to efficiently test a wide range of compositions, and narrow down candidates having high strength and good surface durability after nitriding. |