Ultra-high strength multphase high-entropy alloys
AssigneesIowa State University Research Foundation, Inc., National Technology & Engineering Solutions of Sandia, LLC
InventorsIver E. Anderson, Emma Marie Hamilton White, Duane Johnson, Nicolas Argibay, Andrew B. Kustas, Michael Chandross, Raymond V. Puckett
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Abstract
Refractory-reinforced multiphase high entropy alloys (RHEAs) advantageously providing high strength and fracture toughness in an as-AM deposited condition and other conditions are described.
Claims20
An alloy having Al and Ti as major alloy constituents and Nb, Zr, Mo, and Ta as minor alloy constituents whose minor collective content is effective to provide a polyphase microstructure including at least four compositionally distinct intermetallic phases.
An alloy having a composition represented by Al0.42Ti0.25Nb0.13Zr0.08Mo0.08Ta0.04 that has a polyphase microstructure including at least four (4) compositionally distinct intermetallic phases or variants of the composition wherein content of at least one of Al, Ti, Nb, Zr, Mo, and Ta is so varied that the alloy has Al+Ti content greater than 50 atomic % and that the alloy has a polyphase microstructure including four (4) compositionally distinct intermetallic phases and exhibits a mechanical strength that is independent of temperature up to 800° C.
An alloy having a composition represented by Al0.42Ti0.25Nb0.13Zr0.08Mo0.08Ta0.04 that has a polyphase microstructure including at least four (4) compositionally distinct intermetallic phases or variants of the composition wherein content of at least one of Al, Ti, Nb, Zr, Mo, and Ta is so varied that Al+Ti content is greater than 50 atomic % and that the alloy has a polyphase microstructure including at least four (4) compositionally distinct intermetallic phases.
An alloy having an Al content greater than 20 atomic % to less than about 70 atomic %, an Al+Ti content greater than 55 atomic % and less than about 75 atomic %, and a collective content of Nb, Zr, Mo, and Ta of about 25 atomic % to about 45 atomic % wherein the alloy has a polyphase microstructure including at least four compositionally distinct intermetallic phases.
Dependencies are inferred from the claim text.