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Opportunity at Air Force Research Laboratory (AFRL)

High Temperature Oxidation and Environmental Resistance in Concentrated Refractory Alloys

Location

Materials & Manufacturing, RX/Structural Materials Division

RO# Location
13.25.05.C0747 Wright-Patterson AFB, OH 454337817

Advisers

name email phone
Todd M Butler todd.butler.8@afrl.af.mil 937.255.1317

Description

Concentrated refractory alloys are an emerging class of alloys that have the potential to push the temperature capability of current metallic solutions.  While these alloys have been shown to have higher specific strength than Ni-base superalloys at elevated temperatures, they have been severely limited by environmental attack.  Recent work has highlighted compositions that have shown increased oxidation resistance in comparison to conventional refractory alloys, which is promoted by the formation of complex refractory oxides.  While this work has identified some beneficial prototype oxide structures, more fundamental work is required to deliver inherent oxidation resistance for structurally sound and ductile concentrated alloys.  We are interested in foundational work focused on inherent oxidation of these complex systems including:  understanding of oxidation thermodynamics and kinetics, identification of protective oxide products and predictive oxidation models.  We are also interested in exploring the use of coatings and surface treatments to increase oxidation resistance while minimally influencing bulk response.

T.M. Butler, “High Entropy Alloys: Oxidation”, Encyclopedia of Materials: Metals and Alloys (2022) 2, 522-532.

 T.M. Butler, O.N. Senkov, T.I. Daboiku, M.A. Velez, H.E. Schroader, L.G. Ware, M.S. Titus, “Oxidation behaviors of CrNb, CrNbTi, and CrNbTaTi concentrated,” Intermetallics 140 (2021), 107374.

T.M. Butler, K.J. Chaput, “Native Oxidation Resistance of Al20Nb30Ta10Ti30Zr10 Refractory Complex Concentrated Alloy (RCCA),” Journal of Alloys and Compounds (2019) 787, 606-617.

Keywords:
oxidation; refractory; superalloy; complex oxide; kinetics; thermodynamics

Eligibility

Citizenship:  Open to U.S. citizens
Level:  Open to Postdoctoral and Senior applicants

Stipend

Base Stipend Travel Allotment Supplementation
$76,542.00 $4,000.00

$3,000 Supplement for Doctorates in Engineering & Computer Science

Experience Supplement:
Postdoctoral and Senior Associates will receive an appropriately higher stipend based on the number of years of experience past their PhD.

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