About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
ON DEMAND: Computational Design of Co-free Complex Concentrated Alloys (CCA) for Nuclear Applications |
Author(s) |
Dinesh Ram, Anna Fraczkiewicz, Franck Tancret |
On-Site Speaker (Planned) |
Dinesh Ram |
Abstract Scope |
Structural materials in a nuclear environment require a set of highly demanding properties. “High entropy matrix” alloys are suspected to impede irradiation damage hence we attempt the computational conception of novel cobalt-free “complex concentrated alloys.” An approach relying on combinatorial exploration and optimization, both with as well as on predictive models that correlate composition, structure, and properties (CALPHAD, solid-solution, and precipitation hardening models, machine-learning) is proposed. Target microstructures are based on γ+γ’ mixtures commonly found in Ni-superalloys. Genetic algorithm multi-objective optimizations in this phase region were set up on the Ni-Cr-Fe-Mn-Mo-Nb-W-Al-Ti system, using the models developed. However, the designed alloys present a moderate configurational entropy. A systematic CALPHAD exploration of the γ+γ’ dual-phase region of the subsystem Ni-Cr-Fe-Mn-Al-Ti indicates that the conception of CCAs in this compositional area is thermodynamically restricted. An outlook into alternative strategies of different reinforcing-phases and strengthening mechanisms to design Co-free CCAs is therefore also proposed. |
Proceedings Inclusion? |
Undecided |