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Title: Nanoindenttion of Bridgman YBCO samples
Author: Roa Rovira, Joan Josep
Konstantopoulou, K.
Jiménez Piqué, Emili
Martín, V.
Segarra Rubí, Mercè
Pastor, J. Y.
Keywords: Superconductors
Materials ceràmics
Ceramic materials
Issue Date: 20-Oct-2011
Publisher: Elsevier B.V.
Abstract: In this study, the mechanical properties of YBa2Cu307_x, obtained by the Bridgman technique, were examined using a Berkovich tip indenter on the basal plane (0 0 1). Intrinsic hardness was measured by nanoindentation tests and corrected using the Nix and Gao model for this material. Furthermore, Vickers hardness tests were performed, in order to determine the possible size effect on these measurements. The results showed an underestimation of the hardness value when the tests were performed with large loads. Moreover, the elastic modulus of the Bridgman samples was 128 ± 5 GPa. Different residual imprints were visualised by atomic force microscopy and a focused ion beam, in order to observe superficial and internal fracturing. Mechanical properties presented a considerable reduction at the interface. This effect could be attributed to internal stress generated during the texturing process. In order to corroborate this hypothesis, an observation using transmission electron microscopy was performed.
Note: Versió postprint del document publicat a:
It is part of: Ceramics International, 2012, vol. 38, num. 2, p. 2035-2042
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ISSN: 0272-8842
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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