Complex pulse magnetization process and mechanical properties of spark plasma sintered bulk MgB2

•Superior critical current density (Jc) and mechanical properties are observed.•An eightfold increment in bending strength is observed compared to HIP based bulks.•Trapped field along with local temperature values are systematically discussed. High-density MgB2 bulks with superior mechanical and sup...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-11, Vol.273, p.115390, Article 115390
Main Authors: Miryala, Muralidhar, Arvapalli, Sai Srikanth, Sakai, Naomichi, Murakami, Masato, Mochizuki, Hidehiko, Naito, Tomoyuki, Fujshiro, Hiroyuki, Jirsa, Milos, Murakami, Akira, Noudem, Jacques
Format: Article
Language:English
Subjects:
Bend strength
Bulk density
Critical current density
Flux pinning
Grain boundaries
Magnesium compounds
Magnetic properties
Magnetization
Mechanical properties
MgB2
Overheating
Plasma sintering
Pulse field magnetization
Spark plasma sintering
Superconductivity
Superconductors
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Summary:•Superior critical current density (Jc) and mechanical properties are observed.•An eightfold increment in bending strength is observed compared to HIP based bulks.•Trapped field along with local temperature values are systematically discussed. High-density MgB2 bulks with superior mechanical and superconducting properties were fabricated using spark plasma sintering (SPS). The sharp superconducting transition at 37.5 K proved high quality of the superconductors. Critical current density significantly exceeded that of conventionally sintered bulks. Flux pinning diagrams indicated dominance of grain boundary pinning, with peak position at 0.2. SPS bulks showed improved mechanical properties with 8-times higher bending strength compared to dense hot isostatic pressed bulks. Trapped field was measured at 14 K and 20 K, 1 mm above the bulk’s surface, with applied pulse field up to 2 T. A local overheating together with a complex trapped field formation in the MgB2 bulks during pulse-field magnetization were studied to elucidate limitations of Pulse Field Magnetization.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2021.115390