| Abstract Scope |
Over the past two decades, high entropy alloys (HEAs) have evolved from a novel concept to a broad field of research. Refractory HEAs have emerged as promising candidates for first-wall fusion materials due to their high-temperature strength and superior radiation tolerance, attributed to their complex composition. However, predicting and balancing key baseline properties (phase stability, strength-ductility trade-off, thermal conductivity and expansion, low neutron activation, etc.) while also understanding RHEA resistance to radiation-induced swelling and hardening remains a challenge. Work at LLNL regarding the design, development, and testing of RHEAs for fusion energy will be presented. This includes solving optimization problems for key baseline properties as well as uncovering radiation-induced atomistic phenomena (displacement, He bubble, and transmutation products) ultimately dictating the long-term performance of first-wall RHEA candidates.
This work was performed under the auspices of the U.S. DOE by LLNL under contract DE-AC52-07NA27344. |