Nanomechanical behavior of 3D porous metal-ceramic nanocomposite Bi/Bi2 O3 films
Domingo-Roca, R. (Universitat Autònoma de Barcelona. Departament de Física)
Esqué-de los Ojos, Daniel (Universitat Autònoma de Barcelona. Departament de Física)
Guerrero, Miguel (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2015
Abstract:	The nanomechanical properties of three-dimensional (3D) porous metal/metal oxide composite (Bi/Bi2O3) films grown by direct current electrodeposition have been studied by nanoindentation at two different loading rates. The synthesized films exhibit a mixture of crystallographic phases of metallic Bi and α-Bi2O3, as evidenced by X-ray diffraction. An in-situ compaction of the sample during the nanoindentation assays has been observed. This in-situ compaction has an influence over both the hardness and elastic modulus of the material, being more important on the latter and, therefore, on the determination of the degree of porosity of the composite film. The influence of the loading rate on the mechanical properties has been investigated. In addition, time-dependent deformation processes (creep tests) have been also performed, revealing an anelastic behavior irrespective of the loading rate. From these creep tests, a viscoelastic non-Newtonian behavior of the sample is evidenced, which is well-described by a three-element Voigt model.
Grants:	Ministerio de Economía y Competitividad MAT2011-27380-C02-01 Ministerio de Economía y Competitividad RYC-2012-10839 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015 Agència de Gestió d'Ajuts Universitaris i de Recerca 2013/ BP-B 00077
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Metal/metal oxide composite ; Nanoindentation ; Loading rate ; Mechanical properties ; Viscoelastic non-Newtonian behavior ; Finite element simulations
Published in:	Materials science & engineering. Structural materials: properties, microstructures and processing, Vol. 626 (Feb. 2015) , p. 150-158, ISSN 0921-5093

DOI: 10.1016/j.msea.2014.12.042

Post-print 25 p, 2.1 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Research articles
Articles > Published articles