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Mechanical and electrical properties of in-situ Al–Al2O3 metal matrix composites (MMCs) fabricated by powder metallurgy approach using different aluminium powders of particle size 0.8–21µm and purity 99.8–99.996% were examined. Hot working powder consolidation by vacuum hot pressing at 270°C and direct extrusion at 425°C and reduction ratio of 7:1 were applied. Subsequently, extruded composite rods...
MgB2 wires with Ti and NbTi barriers have been made by internal magnesium diffusion (IMD) into boron process. Critical currents, strain tolerances and AC loss of wires with Ti and NbTi barriers have been compared. It was shown that worse uniformity of NbTi barrier affects the creation of regular MgB2 layer and consequently influences (reduces) also the current densities. Positive effects of NbTi barrier...
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