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

T E Whitfield, Ed Pickering, C E Talbot, C N Jones, H J Stone, N G Jones

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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.
Original languageEnglish
JournalScripta Materialia
Early online date4 Feb 2020
DOIs
Publication statusE-pub ahead of print - 4 Feb 2020

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