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research-article

Investigation of Mechanical Properties of Mono- and Multilayer Alumina and Ceria Films using Finite Element Modeling and Nanoindentation Experiments

[+] Author and Article Information
Sabina Cherneva

Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 4, 1113 Sofia, Bulgaria
sabina_cherneva@yahoo.com

Desislava Guergova

Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 11, 1113 Sofia, Bulgaria
guergova@abv.bg

Roumen Iankov

Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 4, 1113 Sofia, Bulgaria
iankovr@yahoo.com

Dimitar Stoychev

Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 11, 1113 Sofia, Bulgaria
stoychev@ipc.bas.bg

1Corresponding author.

ASME doi:10.1115/1.4040593 History: Received January 23, 2018; Revised June 20, 2018

Abstract

Important from exploitation point of view mechanical properties of single layer, double-layer and mixed alumina and ceria films and their SS substrate were investigated by means of nanoindentation experiments. As a result we obtained the experimental load-displacement curves and calculated the indentation hardness (HIT) and indentation modulus (EIT), by means of Oliver & Pharr approximation method. Numerical simulations of the process of nanoindentaion by means of finite-element method was performed as well, in order to obtain more information about the plastic properties of the investigated films. The obtained results show that the mixed Al2O3+Ce2O3 film, obtained at dominant concentration of cerium ions in the working electrolyte has the highest indentation hardness and modulus, following by the single Ce2O3-CeO2 film, the mixed Al2O3+Ce2O3 film, obtained at dominant concentration of aluminum ions in the working electrolyte, the double Ce2O3-CeO2/Al2O3 layer and single Al2O3 layer.

Copyright (c) 2018 by ASME
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