Effect of equal channel angular pressing on in vitro degradation of LAE442 magnesium alloy

Minárik, Peter; Jablonská, Eva; Král, Róbert; Lipov, Jan; Ruml, Tomáš; Blawert, Carsten; Hadzima, Branislav; Chmelı́k, František

doi:10.1016/j.msec.2016.12.120

Cited by 48 publications

(21 citation statements)

References 30 publications

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“…Fourteen days of immersion in MEM revealed significant decrease of the degradation rate in the investigated material processed by ECAP when compared to the as-extruded condition. Corrosion rate calculated (887) from weight-loss measurement decreased from 0.44 ± 0.01 mg/cm 2 /day to 0.33 ± 0.03 mg/cm 2 /day as a result of the additional processing [9]. The first investigation of the immersed samples showed lower density of cracks in the corrosion layer of the 12P sample, indicating its higher stability and protectiveness.…”

Section: Resultsmentioning

confidence: 98%

“…The first investigation of the immersed samples showed lower density of cracks in the corrosion layer of the 12P sample, indicating its higher stability and protectiveness. For detailed information, see [9]. Further insight in the corrosion layer structure was performed by analysing the cross-section of the samples, see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous report, we have shown that further processing by equal channel angular pressing (ECAP) might additionally improve the degradation behaviour of this alloy [9]. Twelve passes through ECAP resulted in significant grain refinement and better distribution of secondary phase particles [10].…”

Section: Introductionmentioning

confidence: 93%

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Influence of Tailored Microstructure on the Corrosion Layer Stability in LAE442 Magnesium Alloy

et al. 2018

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Origins of the increased corrosion resistance of the biodegradable LAE442 magnesium alloy processed by equal channel angular pressing (ECAP) were investigated. Samples of the as extruded and ECAPed conditions were immersed in the minimal essential medium (MEM) for 14 days. Microstructure and chemical composition of the corrosion layer formed on both materials was investigated by scanning electron microscope (SEM) equipped with energy-dispersive spectroscope (EDS). The results showed that a more compact corrosion layer was formed on the ECAPed sample than on the extruded one. It contained a lower amount of cracks and its stability was increased by the high density of aluminium particles formed due to ECAP. Additionally, a thicker layer of CaP was observed in the layer formed on the ECAPed sample. It was concluded that ECAP processing of the LAE442 alloy resulted in significant improvement of the corrosion resistance through substantial enhancement of the protective ability of the corrosion layer.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Influence of Tailored Microstructure on the Corrosion Layer Stability in LAE442 Magnesium Alloy

et al. 2018

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“…This concept has been introduced for the ZX10 alloy with a homogeneous microstructure and an average grain size of 11 µm [9]. However, the grain size plays an important role in controlling the mechanical and corrosion properties of biomaterials [6,11]. Therefore, understanding the effect of precompression and applied heat treatment on the resulting mechanical properties with respect to grain size is essential.…”

Section: Introductionmentioning

confidence: 99%

Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy

et al. 2020

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The impact of precompression, thermal treatment and its combination on the deformation behaviour of an extruded Mg–Zn–Ca (ZX10) alloy was studied with respect to a varied average grain size. The Hall–Petch plot was used to highlight the impact in a wide grain size interval. The initial texture of the wrought alloy was characterized by X-ray diffraction. Moreover, the evolution of microstructure and texture was provided by the electron backscatter diffraction (EBSD) technique. The obtained results indicate the strong contribution of deformation-thermal treatment on the resulting deformation behaviour. Particularly, after precompression and heat treatment, higher strengthening effect was observed in the reversed tensile loaded compared to compressed samples without any change in the Hall–Petch slope throughout the grain size interval. Unlike this strengthening effect, a reversed tension–compression yield asymmetry with higher strength values in compression has been obtained.

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“…However, the main limitation is the initial fast degradation of Mg alloys in a biological environment which could not afford effective biomechanical support and match the bone reconstruction [9,10]. In addition to the high corrosion rate, the low bioactivity of magnesium implants such as the ability to form hydroxyapatite (HA) is another challenging problem, which needs to be resolved before utilization in clinical applications [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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Abstract:In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO 2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 µm is generated on the Mg/HA/TiO 2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 µm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO 2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH) 2 , HA, Ca 3 (PO 4 ) 2 , and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO 2 nanocomposite after nine days of incubation.

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Effect of equal channel angular pressing on in vitro degradation of LAE442 magnesium alloy

Cited by 48 publications

References 30 publications

Influence of Tailored Microstructure on the Corrosion Layer Stability in LAE442 Magnesium Alloy

Influence of Tailored Microstructure on the Corrosion Layer Stability in LAE442 Magnesium Alloy

Grain Size-Related Strengthening and Softening of a Precompressed and Heat-Treated Mg–Zn–Ca Alloy

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

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