|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 (Hf<SUB>0.2</SUB>Nb<SUB>0.2</SUB>Ta<SUB>0.2</SUB>Ti<SUB>0.2</SUB>Zr<SUB>0.2</SUB>)C, (Hf<SUB>0.2</SUB>Nb<SUB>0.2</SUB>Ta<SUB>0.2</SUB>Ti<SUB>0.2</SUB>V<SUB>0.2</SUB>)C, and (Nb<SUB>0.2</SUB>Ta<SUB>0.2</SUB>Ti<SUB>0.2</SUB>V<SUB>0.2</SUB>W<SUB>0.2</SUB>)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