Nanomechanical behavior of 3D porous metal-ceramic nanocomposite Bi/Bi2O3 films

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:626

Article

Domingo-Roca, R.¹  Esque-de los Ojos, D.¹  Guerrero, M.¹  Pellicer, E.¹  Baro, M. D.¹  Surinach, S.¹  Sort, J.^1,2 

[1] Univ Autonoma Barcelona, Dept Fis, E-08193 Bellaterra, Spain

[2] Univ Autonoma Barcelona, ICREA, E-08193 Bellaterra, Spain

关键词: Metal/metal oxide composite;    Nanoindentation;    Loading rate;    Mechanical properties;    Viscoelastic non-Newtonian behavior;    Finite element simulations;   

DOI  :  10.1016/j.msea.2014.12.042

来源: Elsevier

【 摘 要 】

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 alpha-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. (C) 2014 Elsevier B.V. All rights reserved.

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