Mechanical characterization of GdBCO/Ag and YBCO single grains fabricated by top-seeded melt growth at 77 and 300 K

Konstantopoulou, Konstantina; Shi, Yunhua; Dennis, Anthony; Durrell, John; Pastor Caño, Jose Ignacio y Cardwell, David (2014). Mechanical characterization of GdBCO/Ag and YBCO single grains fabricated by top-seeded melt growth at 77 and 300 K. "Superconductor Science and Technology", v. 27 (n. 11); pp. 115011-115021. ISSN 0953-2048. https://doi.org/10.1088/0953-2048/27/11/115011.

Descripción

Título: Mechanical characterization of GdBCO/Ag and YBCO single grains fabricated by top-seeded melt growth at 77 and 300 K
Autor/es:
  • Konstantopoulou, Konstantina
  • Shi, Yunhua
  • Dennis, Anthony
  • Durrell, John
  • Pastor Caño, Jose Ignacio
  • Cardwell, David
Tipo de Documento: Artículo
Título de Revista/Publicación: Superconductor Science and Technology
Fecha: 8 Octubre 2014
Volumen: 27
Materias:
Palabras Clave Informales: mechanical properties, HTS bulk materials, microstructure
Escuela: E.T.S.I. Caminos, Canales y Puertos (UPM)
Departamento: Ciencia de los Materiales
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

YBaCuO and GdBaCuO + 15 wt% Ag large, single-grain, bulk superconductors have been fabricated via the top-seeded, melt-growth (TSMG) process using a generic NdBCO seed. The mechanical behavior of both materials has been investigated by means of three-point bending (TPB) and transversal tensile tests at 77 and 300 K. The strength, fracture toughness and hardness of the samples were studied for two directions of applied load to obtain comprehensive information about the effect of microstructural anisotropy on the macroscopic and microscopic mechanical properties of these technologically important materials. Splitting (Brazilian) tests were carried out on as-melt-processed cylindrical samples following a standard oxygenation process and with the load applied parallel to the growth-facet lines characteristic of the TSMG process. In addition, the elastic modulus of each material was measured by three different techniques and related to the microstructure of each sample using optical microscopy. The results show that both the mechanical properties and the elastic modulus of both YBCO and GdBCP/Ag are improved at 77 K. However, the GdBCO/Ag samples are less anisotropic and exhibit better mechanical behavior due to the presence of silver particles in the bulk, superconducting matrix. The splitting tensile strength was determined at 77 K and both materials were found to exhibit similar behavior, independently of their differences in microstructure.

Más información

ID de Registro: 35660
Identificador DC: http://oa.upm.es/35660/
Identificador OAI: oai:oa.upm.es:35660
Identificador DOI: 10.1088/0953-2048/27/11/115011
URL Oficial: http://iopscience.iop.org/0953-2048/27/11/115011
Depositado por: Memoria Investigacion
Depositado el: 17 Jun 2015 10:57
Ultima Modificación: 08 Oct 2015 22:56
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