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. 2023 Jun 7;16(12):4223. doi: 10.3390/ma16124223

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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A magnified fragment of the area shown in Figure 18a and Figure 19a. The incubation process of crack formation revealed on the polished surface of the sample. Light microscopy: (a) non-etched; (b) etched.