1. Observation of a refractory metal matrix containing Zr-Ti- rich precipitates in a Mo0.5NbTa0.5TiZr high entropy alloy
- Author
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Tamsin Whitfield, Ed Pickering, Howard J. Stone, Nick Jones, C. E. P. Talbot, and C.N. Jones
- Subjects
010302 applied physics ,Materials science ,Mechanical Engineering ,Metallurgy ,Alloy ,Metals and Alloys ,Refractory metals ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Matrix (chemical analysis) ,Superalloy ,Mechanics of Materials ,0103 physical sciences ,engineering ,General Materials Science ,0210 nano-technology ,Ductility ,Solid solution - 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.
- Published
- 2020
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