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Extensive deformation behavior of an all-oxide Al2O3-TiO2 nanostructured multilayer ceramic at room temperature

Published online by Cambridge University Press:  31 January 2011

Arcan F. Dericioglu ,
Y.F. Liu  and
Yutaka Kagawa
Arcan F. Dericioglu
Affiliation:
International Center for Young Scientists, National Institute for Materials Science, Tsukuba-shi, Ibaraki 305-0047, Japan; and Department of Metallurgical and Materials Engineering, Middle East Technical University, 06531 Ankara, Turkey
Y.F. Liu
Affiliation:
International Center for Young Scientists, National Institute for Materials Science, Tsukuba-shi, Ibaraki 305-0047, Japan; and Department of Metallurgical and Materials Engineering, Middle East Technical University, 06531 Ankara, Turkey
Yutaka Kagawa*
Affiliation:
Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

An all-oxide Al2O3-TiO2 ceramic multilayer composed of 10–100 nm thick alternating layers was fabricated using the reactive magnetron sputtering process. Microindentation tests were carried out on the multilayer ceramic followed by microstructural observations of the cross-sections of the indented sites to characterize the indentation response of the system. During the observations, it was noted that an extensive room temperature “deformation” occurred in the multilayer ceramic material. The material shows a thickness reduction of as much as ∼40% under a conical indenter at 300 mN of load without microcracking and dislocation-assisted deformation. The room temperature deformation mechanism is governed by the relative movement and rearrangement of the anisotropic nanoscale columnar grains along the intergranular boundaries containing elongated voids. The relative sliding along the intergranular boundaries, and the subsequent granular rotation under indentation were well captured by finite element simulation.

Keywords

SputteringCoatingMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3387 - 3396
Copyright
Copyright © Materials Research Society 2009

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