About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Temperature Dependence of Yield Strength in NbTaTiV-Based Refractory Complex Concentrated Alloys |
| Author(s) |
Mingwei Zhang, Tamanna Zakia, Ayeman Nahin, Mason Kincheloe, Jacob Pustelnik, Michael Lau, Dunji Yu, Yan Chen, Juntan Li, Lia Amalia, Peter Liaw, Haixuan Xu |
| On-Site Speaker (Planned) |
Mingwei Zhang |
| Abstract Scope |
To develop refractory complex concentrated alloys (RCCAs) for extreme-temperature applications, it is essential to understand the mechanisms governing plastic deformation at elevated temperatures. Yield strength in RCCAs typically exhibits a plateau at intermediate temperatures, and understanding its origin is crucial for designing RCCAs with strength retention at elevated temperatures. Recent studies have shown that NbTaTiV exhibits a yield strength plateau beginning around 0.35 Tm and plastic deformation is governed by edge dislocation motion from room temperature up to 1173 K (∼0.55 Tm). This research further investigates the correlation among temperature, vanadium concentration, as well as vacancy concentration on high-temperature mechanical behavior, particularly on the shift from screw to edge dislocation mechanisms. By determining the tensile yield strength of the NbTaTiV system with varying vanadium concentrations and temperatures, this study aims to clarify how these factors influence the dislocation mechanism and contributes to strength retention at elevated temperatures. |