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Open AccessFeature PaperArticle

Magnesium-Based Bioactive Composites Processed at Room Temperature

1
Department of Metallurgical and Materials Engineering, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
2
Department of Chemical Engineering, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
3
Materials Research Group, Department of Mechanical Engineering, University of Southampton, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2609; https://doi.org/10.3390/ma12162609
Received: 21 July 2019 / Revised: 7 August 2019 / Accepted: 11 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Alloys for Biomedical Application)
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PDF [8438 KB, uploaded 16 August 2019]
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Abstract

Hydroxyapatite and bioactive glass particles were added to pure magnesium and an AZ91 magnesium alloy and then consolidated into disc-shaped samples at room temperature using high-pressure torsion (HPT). The bioactive particles appeared well-dispersed in the metal matrix after multiple turns of HPT. Full consolidation was attained using pure magnesium, but the center of the AZ91 disc failed to fully consolidate even after 50 turns. The magnesium-hydroxyapatite composite displayed an ultimate tensile strength above 150 MPa, high cell viability, and a decreasing rate of corrosion during immersion in Hank’s solution. The composites produced with bioactive glass particles exhibited the formation of calcium phosphate after 2 h of immersion in Hank’s solution and there was rapid corrosion in these materials. View Full-Text
Keywords: bioactive glass; biodegradable material; composites; high-pressure torsion; hydroxyapatite; magnesium bioactive glass; biodegradable material; composites; high-pressure torsion; hydroxyapatite; magnesium
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Castro, M.M.; Lopes, D.R.; Soares, R.B.; dos Santos, D.M.M.; Nunes, E.H.M.; Lins, V.F.C.; Pereira, P.H.R.; Isaac, A.; Langdon, T.G.; Figueiredo, R.B. Magnesium-Based Bioactive Composites Processed at Room Temperature. Materials 2019, 12, 2609.

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