Microstructure effect of nano-ceramic composites in nano-indentation tests

Author

Ling, Zhong

Author_Institution

Inst. of Mech., Chinese Acad. of Sci., Beijing, China

Volume

1

fYear

2004

fDate

15-19 June 2004

Firstpage

32

Abstract

The Young´s modulus and hardness of nano-ceramic composites, Al₂O₃/SiC_p, are measured via nanoindenter under peak loads of 3-250 mN and peak depths of 60-920 nm. The testing materials are Al₂O₃ and Al₂O₃ containing SiC particles with volume fractions, 5% and 10%. The size of SiC particle is about 60-100 nm. The experimental results showed that, the measured Young´s modulus in current composites is higher than that of Al₂O₃ while indentation is over some depth, which related to microstructure scales in the composites. It is because of that the contact stiffness is sensitive to the microstructure of current composites. The hardness measured in two composites is depth-dependant but that in Al₂O₃ seems not to be sensitive to the indentation depth.

Keywords

Young´s modulus; alumina; ceramics; crystal microstructure; elastic constants; hardness; indentation; mechanical testing; nanocomposites; nanoparticles; particle size; silicon compounds; 60 to 100 nm; Al₂O₃-SiC; SiC particles; Young´s modulus; hardness measurement; microstructure effect; microstructure scales; nanoceramic composites; nanoindentation tests; stiffness; Atomic force microscopy; Capacitive sensors; Ceramics; Composite materials; Current measurement; Materials testing; Mechanical factors; Microstructure; Residual stresses; Silicon carbide;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on

Print_ISBN

0-7803-8273-0

Type

conf

DOI

10.1109/WCICA.2004.1340477

Filename

1340477