Corrosion Fatigue of Fine Grain Mg-Zn-Zr and Mg-Y-Zn Alloys

Linderov, Mikhail; Васильев, Е. В.; Мерсон, Д. Л.; Маркушев, М. В.; Vinogradov, Alexei

doi:10.3390/met8010020

Cited by 16 publications

(9 citation statements)

References 31 publications

(32 reference statements)

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“…Как следствие, улучшение физико-механических свойств магния путем легирования в большинстве случаев приводит к ухудшению его коррозионных свойств, тем самым, в условиях коррозионной среды сводя на нет весь достигнутый эффект повышения усталостных свойств за счет твердорастворного упрочнения [6]. Когда же, помимо химической коррозии, реализуется электрохимическая, то долговечность магниевых сплавов на уровне предела выносливости 2 ×10 7 циклов вообще стремиться к нулю [7]. Кроме того, применение временных металлических конструкции в реконструктивной медицине предполагает, что с целью обеспечения оптимального режима остеосинтеза скорость процесса их саморассасывания в первые два-три месяца должна быть минимальной.…”

Section: Introductionunclassified

Regulation of corrosion damage of magnesium alloys through the use of vacuum zirconium coatings

et al. 2021

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Magnesium alloys have a unique combination of properties in terms of specific strength, modulus of elasticity and biocompatibility, which allows them to be considered as one of the most promising materials for use as temporary bioresorbable implants capable of being replaced by bone tissue in the process of gradual dissolution in the human body, thereby eliminating the need for repeated surgical intervention to remove the implant after healing. In this regard, the world scientific community pays much attention to works aimed at developing methods for controlling the corrosion damage of magnesium alloys. The present study demonstrates that such a precision control can be realized using vacuum zirconium coatings, while Zr itself is already actively used in medicine. It has been shown that the application of a zirconium coating on the MA14 (ZK60) alloy, which is currently considered as one of the possible candidates for use in medical practice, with thicknesses of 0.4 and 0.8 μm, can reduce the corrosion damage estimated by the hydrogen yield, based on 110 hours per 1.3 and 1.6 times, respectively. The favorable effect of the zirconium coating on the resistance to corrosion processes is confirmed by the results obtained using a laser confocal microscope: a decrease in both the total corroded area and the depth of corrosion damage was recorded in three-dimensional images of the sample surface. In addition, in the work using scanning electron microscopy, a comprehensive study of the obtained coatings is presented, which made it possible to characterize its structure and chemical composition. The adhesion characteristics of the coating were evaluated by scratching on a tester and showed that for a coating with a thickness of 0.8 μm, fracture is observed at an indentation load of the conical indenter of the order of 0.5 N.

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Section: Introductionunclassified

Regulation of corrosion damage of magnesium alloys through the use of vacuum zirconium coatings

et al. 2021

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“…Due to cyclic loads amplified at these stress risers, the fatigue cracks propagate quickly inside the specimen, resulting in the increasing influence of mechanical factors such as notch sensitivity and stress intensity in fatigue development. As has been shown in [92], the significance of the microstructural factors concurrently reduces.…”

Section: Discussionmentioning

confidence: 82%

On the Corrosion Fatigue of Magnesium Alloys Aimed at Biomedical Applications: New Insights from the Influence of Testing Frequency and Surface Modification of the Alloy ZK60

et al. 2022

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Magnesium alloys are contemporary candidates for many structural applications of which medical applications, such as bioresorbable implants, are of significant interest to the community and a challenge to materials scientists. The generally poor resistance of magnesium alloys to environmentally assisted fracture, resulting, in particular, in faster-than-desired bio-corrosion degradation in body fluids, strongly impedes their broad uptake in clinical practice. Since temporary structures implanted to support osteosynthesis or healing tissues may experience variable loading, the resistance to bio-corrosion fatigue is a critical issue that has yet to be understood in order to maintain the structural integrity and to prevent the premature failure of implants. In the present communication, we address several aspects of the corrosion fatigue behaviour of magnesium alloys, using the popular commercial ZK60 Mg-Zn-Zr alloy as a representative example. Specifically, the effects of the testing frequency, surface roughness and metallic coatings are discussed in conjunction with the fatigue fractography after the testing of miniature specimens in air and simulated body fluid. It is demonstrated that accelerated environmentally assisted degradation under cyclic loading occurs due to a complicated interplay between corrosion damage, stress corrosion cracking and cyclic loads. The occurrence of corrosion fatigue in Mg alloys is exaggerated by the significant sensitivity to the testing frequency. The fatigue life or strength reduced remarkably with a decrease in the test frequency.

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“…The billet was preheated to 425 °C and the first four MIF cycles were carried out at this temperature. The following cycles were performed with a 25 °C temperature reduction after every four cycles with the final cycles carried out at 325 °C [ 54 ]; finally, the billet was upset at 325 °C and cut into plates.…”

Section: Methodsmentioning

confidence: 99%

Monitoring Dynamic Recrystallisation in Bioresorbable Alloy Mg-1Zn-0.2Ca by Means of an In Situ Acoustic Emission Technique

et al. 2022

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The tensile behaviour of the biocompatible alloy Mg-1Zn-0.2Ca (in wt.%) in the fine-grained state, obtained by severe plastic deformation via multiaxial isothermal forging, has been investigated in a wide range of temperatures (20 ÷ 300) °C and strain rates (5 × 10−4 ÷ 2 × 10−2) s−1 with the measurements of acoustic emission (AE). The dependences of mechanical properties, including the yield stress, ultimate strength, ductility, and the strain-hardening rate, on the test temperature and strain rate, were obtained and discussed. It is shown for the first time that an acoustic emission method is an effective tool for in situ monitoring of the dynamic recrystallisation (DRX) process. The specific behaviour of the acoustic emission spectral density reflected by its median frequency as a function of strain at various temperatures can serve as an indicator of the DRX process’s completeness.

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Corrosion Fatigue of Fine Grain Mg-Zn-Zr and Mg-Y-Zn Alloys

Cited by 16 publications

References 31 publications

Regulation of corrosion damage of magnesium alloys through the use of vacuum zirconium coatings

Regulation of corrosion damage of magnesium alloys through the use of vacuum zirconium coatings

On the Corrosion Fatigue of Magnesium Alloys Aimed at Biomedical Applications: New Insights from the Influence of Testing Frequency and Surface Modification of the Alloy ZK60

Monitoring Dynamic Recrystallisation in Bioresorbable Alloy Mg-1Zn-0.2Ca by Means of an In Situ Acoustic Emission Technique

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