Comparison of Experimental and Theoretical Indentation Moduli of Anisotropic Single Crystals

Yukimi Tanaka, Yutaka Seino, Koichiro Hattori

Abstract

Nanoindentation is a useful method for measuring elastic modulus. However, the elastic modulus of anisotropic single crystal measured by nanoindentation is often different from theoretical value calculated by elastic constants. Hence, we investigated the cause of the problem above by measuring indentation moduli of 4H-SiC, sapphire and quartz with a Berkovich and a spherical indenter. Consequently, the experimental elastic moduli were 5-15 percent higher than the theoretical value regardless of indenter shape and calculation method. The difference between theoretical and experimental modulus suggests to be not concerned with underestimation of contact area due to plastic deformation such as pile-up.

Keywords

nanoindentation, elastic modulus, SiC, sapphire, quartz

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DOI

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IMEKO TC

TC5 - Hardness Measurement

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