Nanoindentation for Thin Film < 100 nm
Nanoindentation is the preferred method for testing thin film and surface mechanical properties of regular solids. Nanoindentation is used to measure the elastic modulus, hardness, and fracture toughness.
Nanoindentation is the preferred method for testing thin film and surface mechanical properties of regular solids. Nanoindentation is used to measure the elastic modulus, hardness, and fracture toughness.
How nanoindentation test method works
A diamond indenter with a tip as small as 100 nm is used in this test (Figure 1). The diamond point is lowered and pressed into the test sample with a known load, for a specified dwell time, and the dimension of the resulting indentation is measured using a microscope. The area of the indentation and the weight of the load are then used to calculate the hardness of the thin film material. Figure 2 shows a schematic diagram of rockwell superficial hardness test assembly.
Strengths of nanoindentation test
Limitations nanoindentation test
Uses of nanoindentation test
Nanoindentation is used to determine the mechanical properties of the microstructure of a wide range of materials. It is used to characterize thin films in electronics, and coatings for thermal barriers. It is also used to determine viscoelastic properties, microhardness, and scratch and wear resistance of different products.
Sample requirements:
The specimen should be solid. It should be small in size, 2 cm x 2 cm. Its surface should be smooth and flat.
References:
[1] Jiapeng, S., Cheng, L., Han, J. et al. Nanoindentation Induced Deformation and Pop-in Events in a Silicon Crystal: Molecular Dynamics Simulation and Experiment. Sci Rep 7, 10282 (2017). https://doi.org/10.1038/s41598-017-11130-2
[2] https://en.wikipedia.org/wiki/Nanoindentation#/media/File:Nanoindentation_CSM_schematics.png
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