DEVELOPMENT AND ADDITIVE MANUFACTURING OF REFRACTORY HIGH ENTROPY ALLOYS FOR EXTREME ENVIRONMENT APPLICATIONS

Date

2023-8-25

Author

Tukaç, Özgün Umut

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This study primarily focuses on the development and manufacturing of Cr10Mo25Ta25Ti15V25 Refractory High Entropy Alloy (RHEA) using conventional and additive manufacturing (AM) techniques. The aim of this study was to develop a novel RHEA grade displaying attributes such as exceptional ductility, moderate density, and outstanding high-temperature stability. To design the alloy, a dual strategy of empirical calculations and CALPHAD (CALculation of PHAse Diagrams) studies was employed. First, conventional Vacuum Arc Melting (VAM) technique was used to produce a single phase Cr10Mo25Ta25Ti15V25 RHEA with small amount of FCC-Ti phase. This alloy, which showed no formation of the typically brittle HCP phase, exhibited impressive strength and ductility. Directed Energy Deposition (DED) AM technique was explored for the Cr10Mo25Ta25Ti15V25 RHEA production. Detailed analyses highlighted challenges in achieving homogenization and identified distinct phase formations. More importantly, DED-produced RHEA samples displayed improved mechanical properties across different temperatures compared to VAM-produced samples. Overall, this research emphasizes the potential and adaptability of the Cr10Mo25Ta25Ti15V25 RHEA for the varying production techniques, setting the foundation for further exploration and potential applications in the metallurgical industry.

Subject Keywords

Refractory High Entropy Alloys, Additive Manufacturing, CALPHAD, Characterization

URI

https://hdl.handle.net/11511/105249

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Graduate School of Natural and Applied Sciences, Thesis