Mechanical properties of Ag-doped top-seeded melt-grown YBCO pellets

• Autor(a) principal: Foerster,C. E.
• Data de Publicação: 2008
• Outros Autores: Lima,E., Rodrigues Jr.,P., Serbena,F. C., Lepienski,C. M., Cantão,M. P., Jurelo,A. R., Obradors,X.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Physics
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332008000300006
• topic: YBaCuO; Anisotropy; Hardness; Elastic modulus; Instrumented indentation; Fracture toughness

In the present work we report the mechanical properties of ca(b)-planes of Ag-doped top-seeded melt-grown YBaCuO (YBCO) pellets at different concentrations. Hardness and elastic modulus were obtained by instrumented indentation and fracture toughness by conventional Vickers indentation. Hardness profiles for both planes indicated values between 7-8 GPa at deep tip penetration. Significant differences in elastic modulus were observed as a function of Ag content for the ab-plane while no difference were seen for the ca(b)-plane. Doping with 5 wt. % Ag2O increases the hardness and elastic modulus for the ab-plane in relation to the undoped sample due to Ag solid-solution hardening. Indentation fracture toughness rises with Ag doping for the ab-plane. Intensive plastic deformation was observed in ca(b) plane for conventional Vickers indentation.