Effect of Zr on the Microstructure of Second- and Third-Generation BCC HEAs

The possible effect of Zr on the microstructural evolution of second- and third-generation body-centered cubic high-entropy alloys with increasing temperature was investigated by comparing two pairs of alloys differing from one another only by the presence of Zr in one of them. The experimental proc...

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Bibliographic Details
Published in:JOM (1989) 2019-02, Vol.71 (2), p.673-682
Main Authors: Eshed, E., Larianovsky, N., Kovalevsky, A., Katz Demyanetz, A.
Format: Article
Language:English
Subjects:
Aerospace industry
Alloys
Chemistry/Food Science
Corrosion resistance
Earth Sciences
Electric arc furnaces
Electropositivity
Engineering
Entropy
Environment
Evolution
High entropy alloys
Intermetallic compounds
Investigations
Mechanical properties
Microstructure
Physics
Scanning electron microscopy
Solid solutions
Technological Innovations in Metals Engineering
Temperature
Water quenching
Zirconium
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Summary:The possible effect of Zr on the microstructural evolution of second- and third-generation body-centered cubic high-entropy alloys with increasing temperature was investigated by comparing two pairs of alloys differing from one another only by the presence of Zr in one of them. The experimental procedure comprised alloying in an arc furnace with subsequent thermal treatments at 1000°C and 1300°C, followed by water quenching. We found that Zr tended to segregate as the temperature was increased, through formation of various intermetallic compounds owing to its highly electropositive nature. In the third-generation matrix, however, this segregation trend was somewhat mitigated by redissolution of much of the Zr in a NbTiZr-based solid solution which formed in the as-cast product. Without Zr, this third-generation matrix displayed severe Ti segregation.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-018-3198-0