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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/).
SEM fractography images of the alloy ZK60 specimen fatigued to fracture in air: (a) overview of the fracture surface (a) and a magnified view of the crack initiation site (b), pointed to by a red arrow in (a).