| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Understanding High Entropy Materials via Data Science and Computational Approaches
|
| Presentation Title |
Predicting Intrinsic Ductility of Refractory High Entropy Alloys |
| Author(s) |
Michael C. Gao, Saro San, David E. Alman, Vishnu Raghuraman, Mike Widom |
| On-Site Speaker (Planned) |
Michael C. Gao |
| Abstract Scope |
Refractory high entropy alloys (RHEAs) hold great potentials for ultrahigh temperature applications beyond the current-state-of-the-art nickel-based superalloys. The wide mutual solubility among refractory metal elements in the body centered cubic (BCC) structure makes it feasible to form single-phase solid solution over large ranges of temperature and composition. While being mechanically strong, RHEAs often suffer from low tensile ductility at room temperature. In this talk, we first review experimental results on ductility versus strength for reported RHEAs. Next, we will present our modeling and simulation results based on various ductility criteria, including Pugh’s ratio, Cauchy pressure, D parameter (ratio of surface energy over unstable stacking fault energy), ζ parameter based on shear instability, and ab initio tension tests on a series of binary and ternary refractory alloys and RHEAs. |