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. 2021 Jul 2;13(7):125. doi: 10.1007/s12520-021-01378-1

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Microstructures. Axe ID S001 from Prigglitz-Gasteil: a SEM image showing coring, CuS-inclusions (dark grey), and broken (α + δ) eutectoid (light grey). Winged axe inv.no. UF-19.452 from Grünbach: b Unetched, in polarized light. Bacterial induced corrosion is visible. Chisel ID S041 from Kammerwandgrotte: c Unetched. Coring is visible as massively elongated CuS-inclusions. The corrosion follows the microstructural features inter- and intracrystallinearly. Socketed axe ID S042 from Ternitz: d Unetched. Coring is visible. At the centre, one can see (α + δ) eutectoid (light grey) with surrounding inter- and intracrystalline corrosion, under which are cuprite (dark grey, below the eutectoid) and a copper inclusion. The CuFeS-inclusions (dark grey) are not significantly deformed. e Etched with ferric chloride. Note the deformed grains of α-solid solution with deformed twins and strain lines. Socketed axe inv.no. UF-5098 from Sieding: f Etched with ferric chloride. Note the deformed grains of α-solid solution with deformed twins and strain lines