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Nano-mechanical properties of silver-welded YBCO bulks
Roa Rovira, Joan Josep; Bartolomé, E.; Bozzo, Bernat; Capdevila, X.G.; Granados García, Xavier; Segarra, M.
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
The mechanical properties of melt-textured YBCO bulk boundaries are a topic of special interest especially in the manufacturing of superconductor devices for engineering applications. Instrumented indentation technique is a powerful tool widely employed to characterize the mechanical properties of small volumes. We presented results of the nanohardness (H) and Young’s modulus (E) across [001]-welds fabricated by silver welding. The residual imprints performed by a sharp tip indenter were observed by Field Emission Scanning Electron Microscope (FE-SEM) to investigate the different fracture mechanisms nucleated during the indentation process. Results show a decrease of the nanohardness across the grain boundary related to the appearance of a “welding path” free of Y-211 particles. The FE-SEM images show chipping and sink-in effects in that region. Remarkably, for zero-angle welds the mechanical properties are unaltered across the joint, thus probing the high quality of silver welds for large-scale applications.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Superconductors d'alta temperatura -- Propietats mecàniques
Attribution-NonCommercial-NoDerivs 3.0 Spain

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