Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 24: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 4
MM 24.5: Talk
Wednesday, September 7, 2022, 17:15–17:30, H45
Microstructure and hardness of self-passivating SMART alloys manufactured via field assisted sintering technology — •Jie Chen1, Andrey Litnovsky1, Xiaoyue Tan2, and Christian Linsmeier1 — 1Forschungszentrum Jülich GmbH, IEK-4, 52425 Jülich, Germany — 2School of Materials Science and Engineering, Hefei University of Technology, 230009 Hefei, China
Self-passivating Metal Alloys with Reduced Thermo-oxidation (SMART) with a composition of W-11.4wt%Cr-0.6Y% is a promising candidate for plasma facing material of a future fusion power plant. In addition to sputtering resistance under plasma exposure, the laboratory-made bulk SMART system has exhibited excellent antioxidation performance at 1273K in humid environment relevant to accident conditions. The field assisted sintering technology is applied to manufacture SMART alloy. The microstructure of SMART alloy is intimately related to production parameters including heating ramp, sintering temperature, thermal holding time and applied pressure. Heating rate and appropriate sintering temperature are considered important to obtain ultrafine or nanosized grain. The machinability of sintered SMART alloy is under investigation in which hardness and thermal conductivity are of particular interest. The as-sintered SMART alloy with 1217 HV0.5 is obtaned by heating at a rate of 200K/min to 1460*C and applying pressure of 50 MPa. There is an attempt to reduce the material*s hardness to facilitate its application in fusion reactor. Details of the work are presented in the contribution.