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Microestructura y comportamiento plástico de perovsquitas conductoras protónicas de alta temperatura

 

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Opened Access Microestructura y comportamiento plástico de perovsquitas conductoras protónicas de alta temperatura
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Author: Martínez Fernández, Julián
Sayir, A.
Ramírez Rico, Joaquín
Ramírez de Arellano López, Antonio
López Robledo, Manuel Jesús
Date: 2005
Published in: Boletín de la Sociedad Española de Cerámica y Vidrio 44(5), 347-351
Document type: Article
Abstract: Se ha estudiado el comportamiento en fluencia de perovsquitas conductoras protónicas de alta temperatura fabricadas por fusión láser, en particular los sistemas SrCe0.9Y0.1O3-δ y Sr3Ca1.18Nb1.82O9-δ. Se ha estudiado la microestructura antes y despué...
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The creep behaviour of high temperature proton conducting perovskites SrCe0.9Y0.1O3-δ and Sr3 Ca1.18Nb1.82O9-δ fabricated by laser fusion has been studied. Their microstructure has been studied both in the as-received and crept samples by means of Scanning Electron Microscopy (SEM) and Electron BackScattering Diffraction (EBSD), to correlate plastic behaviour with the evolution of the microstructure. The materials show a cellular structure consisting of elongated grains embedded in an amorphous phase and a strong bi-axial crystallographic texture. Deformation tests at constant stress (creep tests) have been performed both in Ar atmosphere and in air. Rigid grain rotation has been observed in the crept samples by EBSD. The amorphous phase flows outside the sample during creep. Plastic behaviour of these materials is independent of the environmental atmosphere and is consistent with a mechanism of viscous flow of the amorphous phase controlled by diffusion.
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URI: http://hdl.handle.net/11441/17596

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