About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond IV
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Presentation Title |
Surface Enhancement of Refractory Multi-principal Element Alloys Containing Al by Gas Nitriding |
Author(s) |
Yu-Hsuan Lin, David Poerschke |
On-Site Speaker (Planned) |
Yu-Hsuan Lin |
Abstract Scope |
Refractory multi-principal elements alloys (MPEAs) are attractive for high temperature applications with their ability to retain high yield strength to elevated temperatures. Addition of Al and surface modification are strategies to improve their hardness, and wear and corrosion resistance. However, studies on nitriding processes using refractory MPEAs are limited. This work focuses on understanding the competition for nitrogen reaction between Al and the nitride-forming refractory metals, and how the chemistry and the microstructures of the nitrided zones are affected in different alloy compositions. AlxNbTaTiZr and AlxMoNbTaTi (x = 0-0.5), which comprise single BCC solid solution or dual-phase BCC and ordered B2 phase, were prepared by arc melting, annealing, and then processed by gas nitriding. Characterization of the nitride layer growth, phase evolution, and partition of the elements by TEM and EDS provides insight to help MPEA composition design and development of surface enhancement strategies in the future. |