Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals
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 azi...
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doaj-46406517d5b2430eba84cefb50e722b32020-11-24T20:46:44ZengMDPI AGMaterials1996-19442019-05-011210163010.3390/ma12101630ma12101630Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic MineralsCorinna F. Böhm0Patrick Feldner1Benoit Merle2Stephan E. Wolf3Department of Materials Science and Engineering, Institute of Glass and Ceramics, Friedrich-Alexander University Erlangen-Nuremberg, Martensstrasse 5, D-91058 Erlangen, GermanyDepartment of Materials Science and Engineering, Institute I, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 5, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, Institute I, Friedrich-Alexander-University Erlangen-Nuremberg, Martensstrasse 5, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, Institute of Glass and Ceramics, Friedrich-Alexander University Erlangen-Nuremberg, Martensstrasse 5, D-91058 Erlangen, GermanyThe 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.https://www.mdpi.com/1996-1944/12/10/1630nanoindentationbiomineralizationhardness anisotropymollusks |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Corinna F. Böhm Patrick Feldner Benoit Merle Stephan E. Wolf |
spellingShingle |
Corinna F. Böhm Patrick Feldner Benoit Merle Stephan E. Wolf Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals Materials nanoindentation biomineralization hardness anisotropy mollusks |
author_facet |
Corinna F. Böhm Patrick Feldner Benoit Merle Stephan E. Wolf |
author_sort |
Corinna F. Böhm |
title |
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals |
title_short |
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals |
title_full |
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals |
title_fullStr |
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals |
title_full_unstemmed |
Conical Nanoindentation Allows Azimuthally Independent Hardness Determination in Geological and Biogenic Minerals |
title_sort |
conical nanoindentation allows azimuthally independent hardness determination in geological and biogenic minerals |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-05-01 |
description |
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. |
topic |
nanoindentation biomineralization hardness anisotropy mollusks |
url |
https://www.mdpi.com/1996-1944/12/10/1630 |
work_keys_str_mv |
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1716811701251211264 |