Conical nanoindentation allows azimuthally independent hardness determination in geological and biogenic minerals

Journal article


Publication Details

Author(s): Böhm C, Feldner P, Merle B, Wolf S
Journal: Materials
Publication year: 2019
Volume: 12
Journal issue: 10
ISSN: 1996-1944


Abstract

The remarkable mechanical performance of biominerals often relies on distinct crystallographic textures, which complicate the determination of the nanohardness from indentations with the standard non-rotational-symmetrical Berkovich punch. Due to the anisotropy of the biomineral to be probed, an azimuthal dependence of the hardness arises. This typically increases the standard deviation of the reported hardness values of biominerals and impedes comparison of hardness values across the literature and, as a result, across species. In this paper, we demonstrate that an azimuthally independent nanohardness determination can be achieved by using a conical indenter. It is also found that conical and Berkovich indentations yield slightly different hardness values because they result in different pile-up behaviors and because of technical limitations on the fabrication of perfectly equivalent geometries. For biogenic crystals, this deviation of hardness values between indenters is much lower than the azimuthal variation in non-rotational-symmetrical Berkovich indentations.


FAU Authors / FAU Editors

Böhm, Corinna
Feldner, Patrick
Juniorprofessur für Werkstoffwissenschaften (Biomimetische Materialien und Prozesse)
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Merle, Benoit PD Dr. habil.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Wolf, Stephan Prof. Dr.
Juniorprofessur für Werkstoffwissenschaften (Biomimetische Materialien und Prozesse)


How to cite

APA:
Böhm, C., Feldner, P., Merle, B., & Wolf, S. (2019). Conical nanoindentation allows azimuthally independent hardness determination in geological and biogenic minerals. Materials, 12(10). https://dx.doi.org/10.3390/ma12101630

MLA:
Böhm, Corinna, et al. "Conical nanoindentation allows azimuthally independent hardness determination in geological and biogenic minerals." Materials 12.10 (2019).

BibTeX: 

Last updated on 2019-25-06 at 08:38