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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 (http://creativecommons.org/licenses/by/4.0/).
View of the microstructure of the THA-2 with THA-3 (with THA-2 on the top) at a magnification of 200× (a) and 500× (b), (the connection line (joint) is shown by the arrow).