|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmental Degradation of Multiple Principal Component Materials
||B-1: Evaluating the Influences of Microstructural Attributes on the High Temperature Oxidation of a AlCoCrFeNi High Entropy Alloy
||Michael Pavel, Mark L. Weaver
|On-Site Speaker (Planned)
The oxidation behavior of an equiatomic AlCoCrFeNi high-entropy alloy (HEA) has been studied at 1050°C to assess the influence of chemical ordering and ordered phase content on the alloy’s oxidation behavior. Annealing times of 120 and 1000 hours were investigated. TGA studies revealed a 40% decrease in specific mass gain following the 1000 h anneal. The results suggest that this decrease is caused by a reduction in the concentration of vacancies and anti-site defects after annealing, which favors reduced aluminum diffusivity and oxygen penetration, along with increasing alumina growth. The results of these oxidation studies are discussed relative to traditional oxidation theory.
||High-Entropy Alloys, High-Temperature Materials, Other