|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Enhanced Reduction of Stable Oxides: A Synergistic Effect for Processing of a High Entropy Alloy
||Wookyung Jin, Prince Sharma, Animesh Kundu, Ganesh Balasubramanian, Helen Chan
|On-Site Speaker (Planned)
High entropy alloys can be successfully fabricated by the reduction of the constituent oxide powders. During the processing of Cantor alloy CoCrFeNiMn using this technique, it was found that even highly stable oxides such as Cr2O3 and MnO could be partially reduced by annealing in 3% H2 -Argon, at temperatures 1000 – 1250 oC. In addition to the entropy contribution (ΔSss), it is proposed that reduction is enhanced due to the negative enthalpy of solid solution (ΔHss) of the metal in the HEA composition. A series of binary, ternary and quaternary alloys (derived from the elemental set - Co, Cr, Fe, Ni, Mn) were processed by oxide reduction. In each case, the composition of the metallic phase, as well as the microstructure and overall extent of reduction were determined. These results will be discussed in the context of predictions based on values of ΔHss and ΔSss calculated from first principles.
||Planned: Metallurgical and Materials Transactions