|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Novel Co-free multi principal element alloys (MPEAs) for nuclear applications: computational design and experimental evaluation
||Dinesh Ram, Gérard Ramstein, Anna Fraczkiewicz, Franck Tancret
|On-Site Speaker (Planned)
Structural materials in nuclear environments, support heavy mechanical loads and less susceptible to corrosive and irradiation damages. Improved alloys are always expected and searched for. This work involves the computational design of precipitation hardened Co-free MPEAs with different reinforcing phases as observed Ni-based superalloys, with an objective of mechanical and stress-corrosion resistance at least equal to the latter group (e.g.: 718 grade), along with a superior tolerance to irradiation damage. Predictive models that co-relate composition, structure and properties were developed, using both machine learning and CALPHAD (Thermo-Calc). On this basis, multi-objective optimizations were set up on the Ni-Cr-Fe-Mn-Mo-Nb-W-Al-Ti system. Some alloys were selected from a set of Pareto-optimal compositions for fabrication and process optimization, as well as characterization of both microstructure (SEM, TEM, EDX) and mechanical properties (hardness, tensile test, high temperature compression). The new alloys exhibit satisfactory microstructure and mechanical behavior, in good agreement with predictions.
||Computational Materials Science & Engineering, High-Entropy Alloys, Mechanical Properties