|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Rapid Design of High-performance Refractory High Entropy Alloys Aided by Multiscale Modeling and Additive Manufacturing
||Michael C. Gao, David E. Alman, Saro San, William F. Trehern, Chantal K. Sudbrack, Paul D. Jablonski, Vishnu Raghuraman, Mike Widom, Saket Thapliyal, Michael Kirka
|On-Site Speaker (Planned)
||Michael C. Gao
The main challenges in developing next-generation refractory alloys for ultrahigh-temperature service beyond nickel-base superalloys are balancing room temperature ductility & fracture toughness, and high temperature strength and creep resistance, while maintaining comparable oxidation resistance and densities to Ni-base superalloys. This project integrates multi-scale computational modeling with direct energy deposition additive manufacturing to rapidly design precipitation strengthened refractory high entropy alloy for use at 1300 degree Celsius and above. Specifically, high throughput phase diagram calculations and screening are carried out using CALPHAD; density functional theory calculations are performed to predict intrinsic ductility, grain boundary segregation energy, coefficient of thermal expansion and temperature-dependent elastic constants. Down-selected alloys are synthesized in small buttons of about 250g using arc melting for rapid evaluation on microstructure and mechanical properties before employing plasma arc melting and additive manufacturing for producing large ingots. Preliminary computational and experimental results of this project will be presented.