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

doi:10.1016/j.scriptamat.2020.01.028

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

Materials Engineering

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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 language	English
Journal	Scripta Materialia
Early online date	4 Feb 2020
DOIs	https://doi.org/10.1016/j.scriptamat.2020.01.028
Publication status	E-pub ahead of print - 4 Feb 2020

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TTaMNZ Letter Paper(Rev3complete)Accepted author manuscript, 5.57 MB

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

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.",

author = "Whitfield, {T E} and Ed Pickering and Talbot, {C E} and Jones, {C N} and Stone, {H J} and Jones, {N G}",

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T1 - Observation of a refractory metal matrix containing Zr-Ti- rich precipitates in a Mo0.5NbTa0.5TiZr high entropy alloy

AU - Whitfield, T E

AU - Pickering, Ed

AU - Talbot, C E

AU - Jones, C N

AU - Stone, H J

AU - Jones, N G

PY - 2020/2/4

Y1 - 2020/2/4

N2 - 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.

AB - 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.

U2 - 10.1016/j.scriptamat.2020.01.028

DO - 10.1016/j.scriptamat.2020.01.028

M3 - Article

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -

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

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