Compressive properties of pristine and SiC-Te-added MgB2 powders,green compacts and spark-plasma-sintered bulks |
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Authors: | Petre Badica Dan Batalu Mihail Burdusel Mihai A Grigoroscuta Gheorghe V Aldica Monica Enculescu Raluca A Gabor Zhiyong Wang Ruoxuan Huang Peifeng Li |
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Affiliation: | 1. National Institute of Materials Physics, street Atomistilor 405A, 077125 Magurele, Romania;2. Faculty of Materials Science and Engineering, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania;3. National Institute for Research in Chemistry, Splaiul Independentei 202, 060021 Bucharest, Romania;4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore;5. School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K |
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Abstract: | Pristine and (SiC+Te)-added MgB2 powders, green and spark plasma sintered (SPS) compacts were investigated from the viewpoint of quasi-static and dynamic (Split-Hopkinson Pressure Bar, SHPB) compressive mechanical properties The amount of the additive (SiC+Te) was selected to be the optimum one for maximization of the superconducting functional parameters. Pristine and added MgB2 show very similar compressive parameters (tan δ, fracture strength, Vickers hardness, others) and fragment size in the SHPB test. However, for the bulk SPSed samples the ratio of intergranular to transgranular fracturing changes, the first one being stronger in the added sample. This is reflected in the quasi-static KIC that is higher for the added sample. Despite this result, sintered samples are brittle and have roughly similar fragmentation behavior as for brittle engineering ceramics. In the fragmentation process, the composite nature of our samples should be considered with a special focus on MgB2 blocks (colonies) that show the major contribution to fracturing. The Glenn-Chudnovsky model of fracturing under dynamic load provides the closest values to our experimental fragment size data. |
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Keywords: | Compressive properties Split-Hopkinson pressure bar Fractography Fragmentation |
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