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Nanoindentation Technique at Investigating of Aluminum Oxide - CrC Nanoparticles Composite Coating

Published online by Cambridge University Press:  11 February 2011

Maksim V. Kireitseu
Maksim V. Kireitseu*
Affiliation:
Department of Mechanics and Tribology, Institute of Mechanics and Machine Reliability (INDMASH), National Academy of Sciences of Belarus, Lesnoe 19–62, Minsk 223052, Belarus, E-mail: [email protected]
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Abstract

In this paper fatigue and fracture of Al-Al2O3-CrC nanostructured composite coatings was investigated by nanoindentation technique and in-situ experiments performed by a scanning electron microscope to permit examination of freshly exposed surfaces. Crystallography and morphological textures were characterized and fracture resistance was measured. CrC layer improves fracture resistance of alumina layer. CrC layer produced by pyrolitic deposition (CVD) may effectively heal pores and defects of alumina layer. It resulted in high load rating of the composite coating. Experiments reveal that in all cases, the detection of an acoustic signal corresponded to the appearance of a circular cracks seen on surface; in a very few cases, examination of surface after detection of a signal revealed presence of two ring cracks. Degree of toughening associated with crack healing is determined by a number of healed defects and an effectiveness of an individual healing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I7.9
Copyright
Copyright © Materials Research Society 2003

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References

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