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Observation of a refractory metal matrix containing Zr-Ti-rich precipitates in a Mo0.5NbTa0.5TiZr high entropy alloy

Accepted version
Peer-reviewed

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Type

Article

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Abstract

Refractory metal high entropy superalloys (RMHES) offer potentially superior strength at elevated temperatures and lower densities than Ni-based superalloys. However, concerns exist over their ductility as their microstructures comprise fine distributions of refractory metal solid solution precipitates within a Zr- and Ti-rich ordered matrix. Consequently, identifying methodologies to invert this arrangement is critical. Here, we show that removal of Al from the AlMo0.5NbTa0.5TiZr RMHES, enables a microstructure to be obtained comprising Zr-Ti-rich disordered precipitates within a refractory metal matrix. This observation represents a significant development for the field and may help guide future alloy design.

Description

Keywords

High entropy alloy, Microstructural formation, Phase transformations

Journal Title

Scripta Materialia

Conference Name

Journal ISSN

1359-6462

Volume Title

180

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/M005607/1)
EPSRC (1793446)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
Engineering and Physical Sciences Research Council (EP/S019367/1)
EPSRC/Rolls-Royce Strategic Partnership (EP/M005607/1) EPSRC Royce@Manchester (EP/R00661X/1)
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