Universität zu Köln

Li, Muzi ORCID: 0000-0002-5497-9862, Benn, Felix, Derra, Thomas ORCID: 0000-0002-4829-8008, Kroeger, Nadja, Zinser, Max, Smeets, Ralf, Molina-Aldareguia, Jon M., Kopp, Alexander ORCID: 0000-0001-8787-0401 and LLorca, Javier ORCID: 0000-0002-3122-7879 (2021). Microstructure, mechanical properties, corrosion resistance and cytocompatibility of WE43 Mg alloy scaffolds fabricated by laser powder bed fusion for biomedical applications. Mater. Sci. Eng. C-Mater. Biol. Appl., 119. AMSTERDAM: ELSEVIER. ISSN 1873-0191

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Abstract

Open-porous scaffolds of WE43 Mg alloy with a body-center cubic cell pattern were manufactured by laser powder bed fusion with different strut diameters. The geometry of the unit cells was adequately reproduced during additive manufacturing and the porosity within the struts was minimized. The microstructure of the scaffolds was modified by means of thermal solution and ageing heat treatments and was analysed in detail by means of X-ray microtomography, optical, scanning and transmission electron microscopy. Moreover, the corrosion rates and the mechanical properties of the scaffolds were measured as a function of the strut diameter and metallurgical condition. The microstructure of the as-printed scaffolds contained a mixture of Y-rich oxide particles and Rare Earth-rich intermetallic precipitates. The latter could be modified by heat treatments. The lowest corrosion rates of 2-3 mm/year were found in the as-printed and solution treated scaffolds and they could be reduced to -0.1 mm/year by surface treatments using plasma electrolytic oxidation. The mechanical properties of the scaffolds improved with the strut diameter: the yield strength increased from 8 to 40 MPa and the elastic modulus improved from 0.2 to 0.8 GPa when the strut diameter increased from 275 mu m to 800 mu m. Nevertheless, the strength of the scaffolds without plasma electrolytic oxidation treatment decreased rapidly when immersed in simulated body fluid. In vitro bicompatibility tests showed surface treatments by plasma electrolytic oxidation were necessary to ensure cell proliferation in scaffolds with high surface-to-volume ratio.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Li, Muzi UNSPECIFIED orcid.org/0000-0002-5497-9862 UNSPECIFIED Benn, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Derra, Thomas UNSPECIFIED orcid.org/0000-0002-4829-8008 UNSPECIFIED Kroeger, Nadja UNSPECIFIED UNSPECIFIED UNSPECIFIED Zinser, Max UNSPECIFIED UNSPECIFIED UNSPECIFIED Smeets, Ralf UNSPECIFIED UNSPECIFIED UNSPECIFIED Molina-Aldareguia, Jon M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopp, Alexander UNSPECIFIED orcid.org/0000-0001-8787-0401 UNSPECIFIED LLorca, Javier UNSPECIFIED orcid.org/0000-0002-3122-7879 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-593513
DOI:	10.1016/j.msec.2020.111623
Journal or Publication Title:	Mater. Sci. Eng. C-Mater. Biol. Appl.
Volume:	119
Date:	2021
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-0191
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RARE EARTH ALLOYS; RAPID SOLIDIFICATION; BANDED STRUCTURE; MAGNESIUM; PRECIPITATION; METALS Multiple languages Materials Science, Biomaterials Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59351