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| Home > Publications database > Smart alloys as armor material for DEMO: Overview of properties and joining to structural materials |
| Home > Publications database > Smart alloys as armor material for DEMO: Overview of properties and joining to structural materials |
| Journal Article | FZJ-2021-00913 |
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2021
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: http://hdl.handle.net/2128/27099 doi:10.1016/j.fusengdes.2021.112272
Abstract: Tungsten test is currently the baseline first-wall armor material for a future DEMOnstration power plant. Smart alloys, containing tungsten (W), 11.4 weight (wt) % chromium (Cr), and 0.6 wt% yttrium (Y), aim at achieving passive safety in case of air ingress into the vacuum vessel and a loss-of-coolant accident causing a temperature rise above 1200 K for weeks. In such a case, smart alloys suppress oxidation and sublimation of radioactive W.This publication summarizes several important properties of smart alloys: the suppression of oxidation, the hardness as a function of the microstructure, and potential carbide formation in the presence of carbon (C) impurities. Further, first results on joining them to the EUROFER by field-assisted sintering technology (FAST) without interface layer are presented. In literature, FAST is also known as spark plasma sintering (SPS). A stable joint with an tungsten–iron (W–Fe) diffusion layer of 100 nm at the interface was achieved. The joint survived several heat cycles to 873 K.
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