Microstructure, texture, mechanical properties and biodegradability of extruded Mg–4Zn‒xMn alloys

Sabbaghian, M.; Mahmudi, R.; Shin, Kwang Seon

doi:10.1016/j.msea.2020.139828

Cited by 49 publications

(10 citation statements)

References 54 publications

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“…During extrusion, the microscale second‐phase hinders the deformation of the substrate, [ 53 ] thus dislocations are entangled and high stress will be generated near the microscale second phase. [ 54 ] The areas can provide sites for DRXed grains nucleation, and the high stress can drive DRXed grains formation. [ 55 ] Therefore, it can be concluded that the more the microscale second phase, the more the DXRed nucleation sites and the more likely to promote the formation of fine DRXed grains.…”

Section: Discussionmentioning

confidence: 99%

Enhancement of mechanical properties and corrosion resistance of Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy by a combination of heat treatment and hot extrusion

Wen

et al. 2021

Materials & Corrosion

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To enhance the mechanical properties and poor corrosion resistance of magnesium alloy in vitro, the as‐cast Mg–2Zn–0.5Zr–1.5Dy (mass%) magnesium alloy was subjected to two types of extrusion treatment, one is hot extrusion (denoted as ET alloy), the other is heat treatment followed by hot extrusion (denoted as HE alloy). The microstructure, mechanical properties, and corrosion behaviors of these extruded alloys are assessed. The results show that the HE alloy has superior mechanical properties and a slower corrosion rate than the ET alloy. The yield strength and elongation of the HE alloy reach 287 ± 10 MPa and 17.6 ± 0.5%, respectively, and its corrosion rate is only 0.59 ± 0.16 mm year−1. After hot extrusion, microscale and nanoscale second‐phase exist in the extruded alloys, and the nanoscale second‐phase can improve their mechanical properties by second‐phase strengthening. However, the presence of microscale second phase can cause galvanic corrosion and result in poor corrosion resistance. The HE alloy has good properties due to it containing more nanoscale second‐phase and fewer microscale second‐phase.

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Section: Discussionmentioning

confidence: 99%

Enhancement of mechanical properties and corrosion resistance of Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy by a combination of heat treatment and hot extrusion

Wen

et al. 2021

Materials & Corrosion

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“…Over the past few years, magnesium and its alloys have attracted increasing attention as promising biodegradable metallic materials. They show superior biocompatibility [ 1 , 2 , 3 ] and biodegradability [ 4 , 5 , 6 ], they have a low density, and they have mechanical properties most similar to bone, in comparison with other metallic materials [ 4 ]. These advantages enable magnesium and its alloys to serve as temporary implants, avoiding the problems associated with permanent metallic implants in terms of stress shielding [ 7 ], inflammation [ 8 ], interference in radiological investigations [ 9 ], and subsequent surgeries for implant removal that result in health-related issues and additional costs.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Plasma Treatment on the Corrosion and Biocompatibility of Magnesium

et al. 2022

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In our study, plasma surface modification was employed to tailor the surface properties of magnesium in terms of surface chemistry, topography, and wettability. For two sets of samples, the plasma treatment involved two steps using two different gases (hydrogen and oxygen), while one set of samples was treated with one step only using oxygen. X-ray photoelectron spectroscopy (XPS) was applied to determine the surface composition, oxidation state of the elements, and the thickness of the surface oxide layer on the Mg samples after different plasma treatments. The surface morphology was characterised using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The wettability was analysed by measuring the static water-contact angles and the corrosion was evaluated using potentiodynamic measurements. The interaction of the live cells with the differently modified Mg surfaces was evaluated in terms of biocompatibility using MG-63 cells (human bone osteosarcoma cells). We have shown that a plasma surface treatment significantly decreased the carbon content and the formation of a 15–20-nm-thick MgO layer was observed. This improves the corrosion resistance, while the biocompatibility was retained, compared to the untreated Mg. A plasma surface treatment is therefore an important step in the development of novel surfaces with improved corrosion resistance for magnesium in biomedical applications.

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“…Meanwhile, as-cast Mg-3Zn alloy was proposed as biodegradable implant due to its mechanical and in vitro corrosion properties [12]. Manganese (Mn) can promote the growth and development of bone, and the addition of Mn to Mg alloys can improve mechanical properties [3,14]. In addition, Mn helps to enhance the corrosion resistance of Mg by removing harmful impurities and forming Mn oxide film [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Mg-2Zn-1Mn alloy showed higher corrosion resistance and more stable degradation behavior than pure Mg and Mg-3Zn alloy [3]. The addition of 0.5 wt% Mn was beneficial to Mg-4Zn alloy by increasing tensile properties and reducing degradation rate [14]. Strontium (Sr) is effective in treating osteoporosis by promoting bone cell growth and increasing bone formation [18,19].…”

Section: Introductionmentioning

confidence: 99%

Determination of Optimum Zn Content for Mg–xZn–0.5Mn–0.5Sr Alloy in Terms of Mechanical Properties and In Vitro Corrosion Resistance

Suh

et al. 2022

Met. Mater. Int.

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This study investigated the microstructure, compressive properties and in vitro corrosion behavior of biodegradable Mg–xZn–0.5Mn–0.5Sr (ZMJ) alloy with Zn content of 0 to 5 wt% in the as-cast state. Increasing the Zn content in ZMJ alloy refined the grains from 215 to 95 µm and changed the secondary particles from Mg17Sr2 to Mg6Zn2Sr and MgZn phases. As the Zn content increased, the compressive yield strength increased from 44 to 67 MPa due to grain boundary strengthening. At immersion in phosphate-buffered saline for 7 days, the addition of Zn from 0 to 0.1 wt% reduced the corrosion rate from 0.71 to 0.48 mm/y, and 0.85 wt% Zn was alloyed to obtain the lowest corrosion rate of 0.45 mm/y. However, adding more Zn significantly increased the corrosion rate up to 3.31 mm/y. Thus, the best anti-corrosion performance can be obtained at 0.85 wt% Zn, which was attributed to its lowest Volta potential difference between the main secondary particles and the α-Mg matrix among ZMJ alloy. Based on this, the optimal Zn content for ZMJ alloy can be determined to be about 1 wt% by comprehensively considering the mechanical properties and in vitro corrosion behavior for biomedical applications. Graphical abstract Micrographs of (a,c) the specimen as-built in vertical direction (Type I) and (b,d) the specimen as-built in horizontal direction (Type II) to the building platform.

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Microstructure, texture, mechanical properties and biodegradability of extruded Mg–4Zn‒xMn alloys

Cited by 49 publications

References 54 publications

Enhancement of mechanical properties and corrosion resistance of Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy by a combination of heat treatment and hot extrusion

Enhancement of mechanical properties and corrosion resistance of Mg–2Zn–0.5Zr–1.5Dy (mass%) alloy by a combination of heat treatment and hot extrusion

The Influence of Plasma Treatment on the Corrosion and Biocompatibility of Magnesium

Determination of Optimum Zn Content for Mg–xZn–0.5Mn–0.5Sr Alloy in Terms of Mechanical Properties and In Vitro Corrosion Resistance

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