Resilient BCC Superalloys for Sustainable Technologies

Objective

The proposed MSCA action pioneers a state-of-the-art generation of BCC-based refractory superalloys (RSAs) engineered to operate reliably beyond 1200 °C, surpassing the limits of Ni-based superalloys. The central idea is a dual-phase architecture that integrates a ductile disordered BCC (A2) matrix reinforced with coherent (B2) precipitates, an approach inspired by the proven framework of Ni-superalloys, but is tailored for refractory chemistries incorporating Nb, Mo, W and Ta. This strategy combines the high melting points and sluggish diffusion kinetics of refractory elements with an architecture that ensures high-temperature strength, room-temperature ductility, and long-term phase stability. By addressing the key fundamental questions of how ductility can be retained and phases stabilized at extreme conditions, the project will deliver alloys with long-term structural integrity. The resulting breakthroughs will open a transformative pathway toward energy-efficient materials for aerospace, power generation, and nuclear systems, in line with global decarbonization targets and initiatives such as ULTIMATE. The action is organized into four interlinked work packages (WPs) forming a closed-loop design-to-validation framework. WP1 applies thermodynamic and predictive modelling to identify and fabricate novel RSA chemistries. WP2 quantifies coarsening kinetics and microstructural stability using advanced microscopy and atom probe analysis. WP3 maps deformation across scales by coupling high-temperature tensile and creep tests with nanoindentation and microscopy. In conclusion, WP4 introduces a novel dimension by exposing RSAs to controlled irradiation environments to evaluate their viability for next-generation nuclear systems. Collectively, these efforts resolve critical challenges in alloy design, stability, mechanical properties, and irradiation tolerance, delivering a materials platform that enhances energy efficiency and resilience in next-generation technologies.