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Microstructure of the novel biomedical Mg–4Y–3Nd alloy prepared by spark plasma sintering
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SYSNO ASEP 0532680 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Microstructure of the novel biomedical Mg–4Y–3Nd alloy prepared by spark plasma sintering Author(s) Minárik, P. (CZ)
Zemková, M. (CZ)
Lukáč, František (UFP-V) ORCID
Bohlen, J. (DE)
Knapek, Michal (UJF-V) ORCID
Král, R. (CZ)Number of authors 6 Article number 153008 Source Title Journal of Alloys and Compounds. - : Elsevier - ISSN 0925-8388
Roč. 819, č. 4 (2020)Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords Implant ; Magnesium ; Microhardness ; Microstructure ; Spark plasma sintering Subject RIV JG - Metallurgy OECD category Materials engineering Subject RIV - cooperation Nuclear Physics Institute - Solid Matter Physics ; Magnetism R&D Projects EF16_013/0001794 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 ; UJF-V - RVO:61389005 UT WOS 000507378300064 EID SCOPUS 85075889190 DOI 10.1016/j.jallcom.2019.153008 Annotation One of the prominent applications of magnesium alloys, thoroughly investigated in recent years, is medicine. The commercial WE43 (Mg-4wt.%Y-3wt.%mischmetal) alloy was reported to exhibit superior in vitro and in vivo performance, however, the presence and possible harmful effect of rare earth (RE) elements mischmetal in this alloy have been vastly debated. For this reason, the RE mischmetal was substituted in this study by pure neodymium, which exhibits rather low toxicity. In this way, a novel WN43 (Mg-4wt.%Y-3wt.%Nd) alloy was prepared, with well-defined composition. In order to attain a good control over the grain size and phase distribution, a modern spark plasma sintering (SPS) method was employed. The main objective of this study was to examine the effect of sintering parameters on the resulting microstructure (type and morphology of secondary phases, grain structure, and residual strain) and microhardness (Hv). The application of relatively high pressure (100 MPa) during consolidation leads to the production of practically fully compact final material. Increasing sintering temperature (from 400 up to 500 °C) stimulated homogenization and stabilization of the microstructure and reduction of the internal strain. On the other hand, the effect of sintering time (3 or 10 min) was rather negligible. Furthermore, the microhardness experiments revealed that the softening effect due to homogenization and decrease in the dislocation density at higher sintering temperatures was well-compensated by precipitation hardening as the hardness values were comparable in all the samples. The understanding of microstructure evolution as a function of sintering parameters can be of particular importance for subsequent mechanical, corrosion and in vivo degradation testing of this novel biomedical magnesium alloy. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0925838819342549?via%3Dihub
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