The Preparation and Oxidation-Resistance Characterization of Refractory High Entropy Alloy
Date
2021-10
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New York State College of Ceramics at Alfred University. Inamori School of Engineering.
Abstract
Refractory high entropy alloys (RHEAs) are newly designed alloys with multi-principal-refractory elements in the system to maintain a solid solution. In this research, 5 novel attempts at a single body centered cubic (BCC) phase RHEas were made and prepared by powder metallurgy method. It turned out that two of them were successfully prepared and maintained as a single BCC phase.
In comparison to WMoTaNbV, MoVTiAl showed exceptional oxidation resistance at 600 °C with less than 6 μm oxide layer thickness after 96 h oxidation in air. Meanwhile, WMoNbTiV showed less oxidation resistance than MoVTiAl after 48 h oxidation at the same temperature but still better performance than WMoTaNbV. Furthermore, WMoNbTiV showed less temperature sensitivity when being oxidized at 800 °C, while WMoTaNbV and MoVTiAl were corroded totally after 24 h oxidation at 800 °C. Although the oxide layer thickness of WMoNbTiV oxidation was ~50% increase compared to 600 °C after 48 h, the oxide layer was slowly growing to 290 μm after 96 h.
Description
Thesis completed in partial fulfillment of the requirements for the degree of Master of Science in Materials Science and Engineering at the Inamori School of Engineering, New York State College of Ceramics at Alfred University
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Thesis
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Keywords
Body-centered cubic metals, Refractory high entropy alloys, Powder metallurgy