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MM: Fachverband Metall- und Materialphysik
MM 34: Mechanical Properties and Alloy Design: e.g. Light-Weight, High-Temperature, Multicomponent Materials II
MM 34.1: Talk
Wednesday, March 20, 2024, 10:15–10:30, C 230
influence of spinodal decomposition on mechanical properties and oxidation resistance of self-passivating WCrY alloy (SMART) for a fusion power plant — •Jie Chen1, Elena Tejado2, Andrey Litnovsky1, Jesus Gonzalez-Julian3, and Martin Bram1 — 1Forschungszentrum Jülich GmbH - Institut für Energie- und Klimaforschung, D-52425 Jülich, Germany — 2Universidad Politécnica a de Madrid - Departamento de Ciencia de Materiales-CIME. E-28040 Madrid, Spain — 3RWTH Aachen University - Institute of Mineral Engineering, 52074 Aachen, Germany
Self-passivating Metal Alloys with Reduced Thermo-oxidation (SMART) with a composition of W-11.4wt%-0.6wt%Y is considered as a promising plasma-facing material in fusion power plants. In the present work, the as-sintered SMART material, fabricated via ball milling and field-assisted sintering, is annealed at 1000°C for different amount of time to trigger spinodal decomposition. With 100 hour annealing, the material is characterized by submicron Cr-rich phases with 69.2at% Cr and W-rich matrix phase. The 100h-annealed alloy is significantly softened (HV1011) compared to the as-sintered state. The three point bending tests have been done from room temperature up to 1100°C and it is found that annealed specimens show both higher strength and fracture toughness at all tested temperatures. The oxidation resistance of annealed samples has also been investigated at 1000°C under synthetic air with 70% relative humidity. Details of the work will be given in this contribution.
Keywords: Self-passivating WCrY alloy; Spinodal decomposition; Thermo-mechanical properties; Oxidation resistance; Nuclear fusion