Magnesium-Based Bioactive Composites Processed at Room Temperature

Castro, Mirian Cabral Moreira de; Lopes, Débora de Oliveira; Soares, Renata Braga; Santos, Diogo M.M. dos; Nunes, Eduardo H.M.; Lins, Vanessa de Freitas Cunha; Pereira, Pedro Henrique R.; Isaac, Augusta; Langdon, Terence G.; Figueiredo, Roberto B.

doi:10.3390/ma12162609

Cited by 13 publications

(21 citation statements)

References 47 publications

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“…On the other hand, machining chips of AZ91 were not consolidated in the same conditions [16]. Also, a recent paper showed the lack of consolidation of an AZ91-Bioactive Glass composite even after 50 turns of HPT [13].…”

Section: Discussionmentioning

confidence: 98%

“…Also, the majority of reports on consolidation of magnesium-based composites are related to commercially pure magnesium as the matrix material. Despite a report of full consolidation of a Mg-Zn-Y alloy [15], recent attempts to consolidate the AZ91 alloy did not produce sound samples [13,16]. Thus, the present paper aims to evaluate the tensile behavior of pure magnesium and a magnesium composite consolidated through HPT and to evaluate the effectiveness in consolidation of an AZ91 magnesium alloy.…”

Section: Introductionmentioning

confidence: 96%

“…Thus, a potential to produce the magnesium-based MMCs with improved performance is apparent. However, a recent paper [13] showed that the tensile behavior of a composite of magnesium with hydroxyapatite is characterized by a high mechanical strength, however, the elongation is significantly reduced compared to pure magnesium processed by HPT [14]. The reason for this lack of ductility in the magnesiumbased composite is not clear yet.…”

Section: Introductionmentioning

confidence: 99%

“…Magnesium can also be mixed with pure aluminum to produce a ductile metastable composite which can be hardened by thermal treatment [12]. Also, bioactive materials can be used to produce a bioactive magnesium-based biodegradable composite [13]. Thus, a potential to produce the magnesium-based MMCs with improved performance is apparent.…”

Section: Introductionmentioning

confidence: 99%

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Consolidation of magnesium and magnesium-quasicrystal composites through high‑pressure torsion

et al. 2019

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It is of great interest to produce magnesium-based composites through room temperature consolidation of particles using highpressure torsion. However, the lack of bonding between the particles compromises the integrity and ductility of such materials. The present work evaluates the microstructure of the composites involving pure magnesium and a magnesium alloy AZ91 with the incorporation of quasicrystal particles as a reinforcement phase. Thus, an Al-Cu-Fe icosahedral quasicrystalline alloy was produced by gas atomization and mixed with magnesium particles in a proportion of 80 % in weight of metal and 20 % of quasicrystal. The mix was processed by different number of turns of high-pressure torsion. The microstructure was observed using scanning electron microscopy and the mechanical behavior was evaluated using tensile testing. Generalized lack of bonding is observed in the AZ91 alloy matrix composite and localized lack of bonding in the pure magnesium matrix. High tensile strength has been achieved after consolidation of pure magnesium with and without quasicrystal reinforcement but all samples display limited ductility. The elongations are less than 5 % in all conditions. This is attributed to pre-existing areas with lack of bonding in the matrix, cracking of the hard particles and lack of bonding between the matrix and the reinforcement particles.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Consolidation of magnesium and magnesium-quasicrystal composites through high‑pressure torsion

et al. 2019

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“…A high number of turns is required in order to produce a solid disc with a well-dispersed reinforcement phase [21]. Accordingly, homogeneous distributions of particles of bioactive glass and hydroxyapatite in magnesium matrices were also obtained after 10 and 50 turns of HPT, respectively [22].…”

Section: Processingmentioning

confidence: 99%

Developing magnesium-based composites through high-pressure torsion

et al. 2019

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Magnesium and its alloys display interesting properties such as low density and biocompatibility but the lack of ductility and low strength compromise their performance in many applications. Fabrication of metal matrix composites may alleviate these challenges and improve overall performance. Magnesium matrix composites can be produced by cold consolidation of particles through high-pressure torsion and this paper summarizes recent findings in processing routes for the fabrication of composites, the microstructure developed, mechanical properties obtained and potential applications. It is shown that ductile materials can be mixed with magnesium by processing half samples placed side by side and hard and brittle materials can be incorporated by processing mixed particles. The distribution of phases may be controlled by the amount of rotation imposed during processing. Well-dispersed second phase particles within a continuous magnesium matrix can be obtained. Thus, it is possible to incorporate bioactive materials within a biodegradable magnesium matrix. Detailed characterization using transmission electron microscopy reveals the processing also refines the grain structure of the metallic matrix. The composites may display good ductility, improved strength and an ability to precipitate intermetallics through thermal treatment. The composites produced using high-pressure torsion have different potential applications including the development of bioactive and biodegradable biological implants.

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Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

et al. 2020

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It is known that magnesium (Mg)-hydroxyapatite (HA) composites can be produced by the room temperature consolidation of particles. Herein, the corrosion behavior of an Mg-HA composite is analyzed, and a direct comparison with pure Mg is made. Samples of Mg-HA and of pure Mg are immersed in Hank's solution for up to 60 h, and the microstructure and corrosion products are characterized by scanning and transmission electron microscopy and X-ray diffraction. Electrochemical tests are used to evaluate the corrosion behavior and a hydrogen evolution test is undertaken to determine the corrosion rate. The results show the corrosion rate of the Mg-HA composite is higher than for pure Mg but decreases significantly after %10 h of immersion in Hank's solution. The increase in corrosion resistance of the composite is attributed to the formation of a protective layer of corrosion products with an external surface layer rich in Ca, P, and O.

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Magnesium-Based Bioactive Composites Processed at Room Temperature

Cited by 13 publications

References 47 publications

Consolidation of magnesium and magnesium-quasicrystal composites through high‑pressure torsion

Consolidation of magnesium and magnesium-quasicrystal composites through high‑pressure torsion

Developing magnesium-based composites through high-pressure torsion

Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

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