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Nanoindentation of Aluminum Single Crystals: Experimental Study on Influencing Factors

1
Department of Earth- and Environmental Science, Ludwig-Maximilian-University, 80333 Munich, Germany
2
Munich University of Applied Sciences, 80335 Munich, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(22), 3688; https://doi.org/10.3390/ma12223688
Received: 10 October 2019 / Revised: 30 October 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
Results from nanoindentation of aluminum single crystals deliver valuable information as model systems for understanding technical aluminum alloys. The effect of the crystal orientation and the azimuthal indenter orientation on indentation hardness and modulus was studied by Vickers indentation (max. load 10 mN) on single crystal surfaces with (100), (110), and (111) orientations. The average indentation hardness varied, depending on the crystallographic orientation, by 1.8%. The anisotropy of the elastic modulus (1.1% of the average modulus) is lowered (indentation averaging effect). This is predicted by explicit approximation of the contact problem (conical indenter, orthotropic material). It was found that indentation hardness and modulus vary periodically with the azimuthal indenter orientation on (100)- and (110)-oriented surfaces (relative amplitude of 1.8% for indentation hardness and 2.6% of the modulus). This is attributed to the combined effect of the indenter geometry and crystal symmetry. For the first time, this effect was quantified for aluminum single crystals. View Full-Text
Keywords: nanoindentation; aluminum; single crystal; micromechanics nanoindentation; aluminum; single crystal; micromechanics
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Filippov, P.; Koch, U. Nanoindentation of Aluminum Single Crystals: Experimental Study on Influencing Factors. Materials 2019, 12, 3688.

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