Homogeneous corrosion of high pressure torsion treated Mg–Zn–Ca alloy in simulated body fluid

Gao, Junheng; Guan, Shao Kang; Ren, Zhen; Yangshan, Sun; Zhu, Shijie; Wang, Bin

doi:10.1016/j.matlet.2010.11.015

Cited by 128 publications

(50 citation statements)

References 10 publications

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“…An improved corrosion resistance in an AZ31 alloy after processing by ECAP was also reported in NaCl and phosphate-buffer solution-PBS and this was attributed to the early formation of a protective layer of corrosion products [28]. It was also reported that HPT processing improved the corrosion resistance of a Mg-2 wt.% Zn-0.24 wt.% Ca alloy [10]. A recent report [29] showed that grain refinement can lead to a higher corrosion rate in materials in which the corrosion current is high, >10 -5 A.cm 2 , but the presence of grain boundaries may help in developing a passive layer in materials with a low corrosion current, <10 -5 A.cm 2 , and this suggests that grain refinement may improve the corrosion resistance.…”

Section: Introductionmentioning

confidence: 60%

“…Thus, samples cut parallel to the extrusion direction exhibit lower corrosion rates than samples cut perpendicular [6] and it was reported also that the corrosion rate decreases with an increase in the intensity of basal planes parallel to the surface [7]. Decreasing the grain size [8,9] and homogenizing the second phase particle distribution [10] also reduces the corrosion rate. Among the thermo-mechanical processing techniques, severe plastic deformation (SPD) processes [11] are gaining significant attention because of their potential for producing fully-dense bulk samples with exceptionally small grain sizes.…”

Section: Introductionmentioning

confidence: 98%

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Effect of severe plastic deformation on the biocompatibility and corrosion rate of pure magnesium

et al. 2017

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Abstract:It is well established that magnesium has a considerable potential for use as a biodegradable material. This report describes the effect of processing by severe plastic deformation (SPD) on the grain refinement, mechanical behavior, biocompatibility and corrosion behavior of commercial purity (CP) magnesium. The material was received as cast slabs and processed by rolling, equal-channel angular pressing and high-pressure torsion to produce samples with average grain sizes in the range of ~0.5 -300 m. The results show that severe plastic deformation does not affect the biocompatibility. However, the corrosion behavior is affected by the processing route. Specifically, SPD processing leads to general corrosion as opposed to localized corrosion in the as-cast and hot-rolled condition.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 98%

Effect of severe plastic deformation on the biocompatibility and corrosion rate of pure magnesium

et al. 2017

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“…Many papers have reported the formation of ultrafine grained structures in pure magnesium [3][4][5][6] and AZ31 [7][8][9][10][11] , AZ61 12 , AZ80 13 , AZ91 [14][15][16] , ZK60 [17][18][19] , Mg-Zn-Y 20,21 , Mg-Gd-Y-Zr 22,23 , Mg-Zn-Ca [24][25][26][27] and Mg-Dy-Al-Zn-Zr 28 alloys. The processed alloys exhibit improved strength but also some papers report superplastic behaviour 16,19,22,29,30 , improved hydrogen storage properties 3,[31][32][33][34][35] and improved corrosion resistance 24,27,36 . Formation of ultrafine grained structures and improved strength are also observed in other metallic materials processed by HPT.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness Evolution in Magnesium Processed by HPT

et al. 2017

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High pressure torsion provides an opportunity to process materials with low formability such as magnesium at room temperature. The present work shows the microstructure evolution in commercially pure magnesium processed using a pressure of 6.0 GPa up to 10 turns of rotation. The microstructure evolution is evaluated using electron microscopy and the hardness is determined using dynamic hardness testing. The results show that the grain refinement mechanism in this material differs from materials with b.c.c. and f.c.c. structures. The mechanism of grain refinement observed at high temperatures also applies at room temperature. The hardness distribution is heterogeneous along the longitudinal section of the discs and is not affected by the amount of deformation imposed to the material.

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“…The ZE41A magnesium alloy with low rare-earth (RE) content is suitable to act a biodegradable material since some RE elements are proven to be tolerated by the human body [14,16]. Our previous work showed that the ZE41A alloy after multi-pass ECAP consists of UFG Mg matrix and homogeneously dispersed second-phase particles, which contribute to better mechanical properties at room temperature and the higher corrosion resistance in NaCl solutions [17,18]. Thus, the aim of this paper is to study the biodegradation behavior of the ECAPed ZE41A alloy in a simulated body fluid, and then tailor the biodegradation rate of the UFG magnesium alloy containing rare-earth elements.…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Behaviors of Ultrafine-Grained ZE41A Magnesium Alloy in DMEM Solution

Jiang

Zhang

et al. 2015

Metals

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Abstract:The main limitation to the clinical application of magnesium alloys is their too-fast degradation rate in the physiological environment. Bio-corrosion behaviors of the ZE41A magnesium alloy processed by multi-pass equal channel angular pressing (ECAP) were investigated in Dulbecco's Modified Eagle Medium (DMEM) solution, in order to tailor the effect of grain ultrafining on the biodegradation rate of the alloy implant. Hydrogen evolution tests indicated that a large number of ECAP passes decreased the stable corrosion rate of the alloy after the initial incubation period. Potentiodynamic polarization curves showed that more ECAP passes made the corrosion potential nobler and the corrosion tendency lower. Corroded surfaces of the ECAPed alloy indicated a higher resistance toward localized corrosion due to the homogeneous redistribution of broken second phases on the ultrafine-grained Mg matrix. It suggests that grain ultrafining can decrease the biodegradable rate of the magnesium alloy-containing rare-earth elements and tailor the lifetime of the biodegradable material.

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Homogeneous corrosion of high pressure torsion treated Mg–Zn–Ca alloy in simulated body fluid

Cited by 128 publications

References 10 publications

Effect of severe plastic deformation on the biocompatibility and corrosion rate of pure magnesium

Effect of severe plastic deformation on the biocompatibility and corrosion rate of pure magnesium

Microstructure and Hardness Evolution in Magnesium Processed by HPT

Biodegradable Behaviors of Ultrafine-Grained ZE41A Magnesium Alloy in DMEM Solution

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