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

SCRIPTA MATERIALIA

卷:180

Article

Whitfield, T. E.¹  Pickering, E. J.²  Talbot, C. E.¹  Jones, C. N.³  Stone, H. J.¹  Jones, N. G.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge, England

[2] Univ Manchester, Dept Mat, Manchester, Lancs, England

[3] Rolls Royce PLC, Derby, England

关键词: High entropy alloy;    Microstructural formation;    Phase transformations;   

DOI  :  10.1016/j.scriptamat.2020.01.028

来源: Elsevier

【 摘 要 】

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. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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