About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond IV
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Presentation Title |
Synthesis and Characterization of High Entropy Nitrides |
Author(s) |
Suprabha Das, Vadym Drozd, Andriy Durygin, Md Shariful Islam Sozal , Mike K Cinibulk, Jesse S Smith, Xianming Bai, Yong Ding, Zhe Cheng |
On-Site Speaker (Planned) |
Suprabha Das |
Abstract Scope |
The purpose of this study is to synthesize bulk high entropy nitrides, which are single-phase nitrides containing 5 or more metal elements at the cationic site, and characterize their physical and chemical properties. The study focuses on the synthesis of (Al0.17Nb0.17Ta0.17Ti0.32Zr0.17)N using the reaction flash sintering method, which involves applying a constant DC electrical field of 40 V/cm and pressure of 15 MPa at room temperature without pre-heating. The flash occurs instantaneously and the entire process takes approximately 350 seconds. The phase composition of the HEN was characterized using both in-situ flash sintering and ex-situ XRD and EDS, while the microstructure was analyzed using SEM and TEM. The study also investigates the oxidation resistance, in situ high-pressure properties, hardness, and fracture toughness, both experimentally and by theoretical calculations, of the HENs. Finally, the explanations for the relationships between HEN composition and microstructure and their oxidation and mechanical properties are hypothesized. |