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Effects of nanofeatures induced by severe shot peening (SSP) on mechanical, corrosion and cytocompatibility properties of magnesium alloy AZ31
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SYSNO ASEP 0486516 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effects of nanofeatures induced by severe shot peening (SSP) on mechanical, corrosion and cytocompatibility properties of magnesium alloy AZ31 Author(s) Bagherifard, S. (IT)
Hickey, D.J. (US)
Fintová, Stanislava (UFM-A) ORCID
Pastorek, F. (SK)
Fernandez-Pariente, I. (ES)
Bandini, M. (IT)
Webster, T. J. (US)
Guagliano, M. (IT)Number of authors 8 Source Title Acta Biomaterialia. - : Elsevier - ISSN 1742-7061
Roč. 66, JAN (2018), s. 93-108Number of pages 16 s. Language eng - English Country GB - United Kingdom Keywords Surface grain refinement ; Severe shot peening ; Biocompatible magnesium alloy ; Cytocompatibility Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 UT WOS 000424309200006 EID SCOPUS 85040558217 DOI 10.1016/j.actbio.2017.11.032 Annotation The application of biodegradable magnesium-based materials in the biomedical field is highly restricted by their low fatigue strength and high corrosion rate in biological environments. Herein, we treated the surface of a biocompatible magnesium alloy AZ31 by severe shot peening in order to evaluate the potential of surface grain refinement to enhance this alloy’s functionality in a biological environment. The AZ31 samples were studied in terms of micro/nanostructural, mechanical, and chemical characteristics in addition to cytocompatibility properties. The evolution of surface grain structure and surface morphology were investigated using optical, scanning and transmission electron microscopy. Surface roughness, wettability, and chemical composition, as well as in depth-microhardness and residual stress distribution, fatigue behaviour and corrosion resistance were investigated. Cytocompatibility tests with osteoblasts (bone forming cells) were performed using sample extracts. The results revealed for the first time that severe shot peening can significantly enhance mechanical properties of AZ31 without causing adverse effects on the growth of surrounding osteoblasts. The corrosion behavior, on the other hand, was not improved, nevertheless, removing the rough surface layer with a high density of crystallographic lattice defects, without removing the entire nanocrystallized layer, provided a good potential for improving corrosion characteristics after severe shot peening and thus, this method should be studied for a wide range of orthopedic applications in which biodegradable magnesium is used. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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