SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Mechanical Properties and Alloy Design: Porous and Nanostructured Materials

MM 22.4: Vortrag

Dienstag, 28. März 2023, 15:00–15:15, SCH A 118

Mechanical properties and oxidation performance of nanostructured self-passivating WCrY material — •Jie Chen1, Andrey Litnovsky1, Jesus Gonzalez-Julian1,2, Jan Willem Coenen1, and Christian Linsmeier11Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany — 2Institute of Mineral Engineering, RWTH Aachen University, 52074 Aachen, Germany

Self-passivating W-11.4wt%-0.6wt%Y alloy have been considered as a promising plasma-facing material in fusion power plants. In the present work, bulk material are fabricated via holding at 1300C for 2 minutes in field-assisted sintering. As a result, an average matrix's grain size of 98.9nm and 6.7% surface area of Cr-rich phase was obtained. Cr-rich phase is formed on the surface of particles during sintering and over 70 at% of Cr is detected by EDX. A hardness HV0.5 of 1287.6 is obtained as a result of small grains while a fraction of Cr-rich phase in the microstructure softens material to some extent. Three point bending tests at temperature up to 1000C are performed to measure fracture toughness and ductile brittle transition temperature. This is done combining with fractography study to investigate the effect of grain size as well as Cr-rich phase on the thermo-mechanical properties. Reduction in grain size down to the order of sub-micrometer range is proven to improve material's anti-oxidation performance in previous study. Oxidation test was performed at 1000C to investigate performance of the microstructure developed. Details of the work are presented in this contribution.

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