About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Computational Design of a Lightweight and Ductile Refractory Alloy |
Author(s) |
Michael Gao, David Alman, Michael Widom |
On-Site Speaker (Planned) |
Michael Widom |
Abstract Scope |
There are urgent needs to develop next-generation alloys beyond Ni-based superalloys. The main obstacles lie in achieving balanced properties, such as optimizing room temperature (RT) ductility, RT fracture toughness, creep, fatigue, thermal stability, and oxidation resistance while remaining light weight and low cost. Here we present our ongoing research effort and progress on the development of high-performance refractory high entropy alloys supported by the ARPA-E ULTIMATE program. High throughput CALPHAD calculations are performed on the Nb-Mo-Ta-Ti-Zr-Hf-V-Cr-Al-C system to search for compositions that meet various thermophysical properties (such as density, cost, and solidus temperature) and promote precipitation of fine carbides We also perform first principles analysis of chemical order and both linear and nonlinear elasticity with a goal of using intrinsic ductility as a guide in our alloy design. Preliminary experimental results on microstructure and mechanical properties will be presented. |
Proceedings Inclusion? |
Undecided |