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Meeting TMS Specialty Congress 2026
Symposium 4th World Congress on High Entropy Alloys (HEA 2026)
Presentation Title Solid State Reduction Synthesis of Refractory High Entropy Alloy CrTaVW: Reduction Mechanism and Microstructural Development
Author(s) Wookyung Jin, Helen M. Chan, Animesh Kundu, Ganesh Balasubramanian
On-Site Speaker (Planned) Wookyung Jin
Abstract Scope Previous work at Lehigh has demonstrated the fabrication of HEA alloys via enhanced reduction of oxide mixtures in dilute hydrogen-argon gas atmospheres, e.g. Cantor alloy derived HEA (CoFeNiMn) and MoNbTaVW. It is proposed that in addition to the entropy contribution (ΔS), the reduction of highly stable oxides is enhanced due to the negative enthalpy of mixing (ΔHmix). This novel process was extended to the refractory HEA (CrTaVW). Starting with the oxides Cr2O3, Ta2O5, V2O5 and WO2, preliminary results show reduction to a two-phase mixture comprising W-based and Ta-based alloys. To achieve better understanding of the complex reduction mechanism, corresponding derivative binary and ternary compositions were studied. The extent of reduction was determined as a function of isothermal treatment time at 1450 °C in 3% H2-Ar. These results will be discussed in the context of predictions based on thermodynamic data for the entropy and enthalpy of mixing in this system.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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