|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||L-92: The Fabrication and Oxidation Behavior of High-entropy Refractory Metal Carbides
||Tyler Harrington, Lavina Backman, Joshua Gild, Jian Luo, Elizabeth Opila, Kenneth Vecchio
|On-Site Speaker (Planned)
Bulk samples of high entropy carbides of the composition (Hf0.2Nb0.2Ta0.2Ti0.2Zr0.2)C, (Hf0.2Nb0.2Ta0.2Ti0.2V0.2)C, and (Nb0.2Ta0.2Ti0.2V0.2W0.2)C were fabricated via high energy ball milling and spark plasma sintering. Further homogenization and greater than 95% theoretical density was achieved via heat treatment at 2500°C following sintering. Virtually single-phase, solid solutions were achieved as determined by EDS and XRD. Oxidation behavior of this new class of ultra-high temperature ceramics was tested using a box furnace for temperatures at or below 1500°C. Ultra-high temperature (T>1500°C) oxidation behavior was tested in controlled environments using a resistive heating apparatus. Oxidation kinetics were determined from the variation of weight and/or oxide thickness with time. Oxide composition and morphology were characterized using XRD, SEM, and EDS. This work serves to further the understanding of a new class high entropy ceramics that are intended to serve in ultra-high temperature applications where oxidation properties are of key importance.
||Planned: Supplemental Proceedings volume