Refractory high entropy superalloys (RSAs)

Complex, concentrated alloys (CCAs) containing refractory principal elements and Al can have microstructures with disordered body-centered cubic (BCC) and ordered B2 phases that are remarkably similar to superalloys. The simple idea of copying superalloy microstructures in these BCC-based refractory...

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Bibliographic Details
Published inScripta materialia Vol. 187; pp. 445 - 452
Main Authors Miracle, Daniel B., Tsai, Ming-Hung, Senkov, Oleg N., Soni, Vishal, Banerjee, Rajarshi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2020
Subjects
High-temperature deformation
Mechanical properties
Metal and alloys
Microstructure
Refractory metals
Structural material
Superalloy
Superalloy
Refractory metals
High-temperature deformation
Mechanical properties
Structural material
Metal and alloys
Microstructure
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Summary:Complex, concentrated alloys (CCAs) containing refractory principal elements and Al can have microstructures with disordered body-centered cubic (BCC) and ordered B2 phases that are remarkably similar to superalloys. The simple idea of copying superalloy microstructures in these BCC-based refractory alloys introduces a set of audacious challenges. BCC metals and B2 compounds are often brittle at room temperature; the B2 phase is unstable in refractory-Al binaries and reasons for its stability in higher-order systems are a mystery; and many refractory metals and alloys display catastrophic oxidation. Here we discuss opportunities and challenges to develop RSAs as new high temperature structural materials. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.06.048