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

Linderov, Mikhail; Brilevsky, Alexander; Мерсон, Д. Л.; Danyuk, A. V.; Vinogradov, Alexei

doi:10.3390/ma15020567

Cited by 15 publications

(6 citation statements)

References 115 publications

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“…An extremely important aspect of implant materials testing is the loading frequency, which, in the case of corrosion fatigue, must be regulated in a much narrower range than in conventional tests in air. For example, an increase in the frequency from 10 Hz to 80 Hz for the popular extruded alloy ZK60 leads to an increase in the endurance limit by more than 1.4 times in Ringer’s solution on the basis of 5 × 10 5 loading cycles [ 231 ].…”

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

“…Fatigue tests were carried out on an Instron ElectroPuls E1000 machine with an alternating loading cycle on corset-type specimens with a nominal cross-section of 2 × 2 mm 2 . The testing conditions were the same as those described in [ 231 ].…”

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

“… A simplified schematic illustration of the corrosion fatigue-induced damage propagation [ 231 ]. ( a ) Initial state with the MgO/Mg(OH) 2 protective film on the surface; ( b ) advanced stage of the corrosion process under stress – the protective film is broken, resulting in the nucleation and growth of corrosion pits and the formation of corrosion product layer; ( c ) initiation of the fatigue crack at the stress concentrator created by the notch-like root of the corrosion pit; ( d ) stress corrosion cracking initiated at the sharp tip of the fatigue crack.…”

Section: Figurementioning

confidence: 99%

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Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

et al. 2023

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This article presents a concise overview of modern achievements and existing knowledge gaps in the area of biodegradable magnesium alloys. Hundreds of Mg-based alloys have been proposed as candidates for temporary implants, and this number tends to increase day by day. Therefore, while reviewing common aspects of research in this field, we confine ourselves primarily to the popular Mg-Zn-Ca system, taken as a representative example. Over the last decades, research activities in this area have grown enormously and have produced many exciting results. Aiming at highlighting the areas where research efforts are still scarce, we review the state-of-the-art processing techniques and summarize the functional properties attained via a wide variety of processing routes devised towards achieving a desired properties profile, including the mechanical response in terms of strength, ductility, and fatigue resistance paired with biocompatibility and bio-corrosion resistance or controlled degradability. We pay keen attention to a summary of corrosion properties and mechano-chemical interactions between an aggressive environment and loaded Mg-based structures, resulting in stress corrosion cracking and premature corrosion fatigue failures. The polemic issues and challenges practitioners face in their laboratory research are identified and discussed.

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Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

Section: Environmentally Affected Mechanical Responsementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

et al. 2023

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“…The ZK60 alloy was chosen as a typical representative of a class of wrought Mg alloys suffering from high susceptibility to PESCC. The grain microstructure and distribution of primary and secondary phases in the commercial hot-extruded alloy used in this work were documented in detail in the previous reports [ 24 , 25 , 30 , 31 ] by the present and other investigators; interested readers are encouraged to review the above-cited publications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution

et al. 2022

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The preliminary exposure of Mg alloys to corrosion solutions can cause their embrittlement. The phenomenon is referred to as pre-exposure stress corrosion cracking (PESCC). It has been reported that relatively long storage in air after pre-exposure to the corrosion solution is capable of eliminating PESCC. This effect was attributed to the egress of diffusible hydrogen that accumulated in the metal during pre-exposure. However, recent findings challenged this viewpoint and suggested that the corrosion solution retained within the side surface layer of corrosion products could be responsible for PESCC. The present study is aimed at the clarification of the role of hydrogen and the corrosion solution sealed within the corrosion products in the “healing” effect caused by post-exposure storage in air. Using the slow strain rate tensile (SSRT) testing in air and detailed fractographic analysis of the ZK60 specimens subjected to the liquid corrosion followed by storage in air, we found that PESCC was gradually reduced and finally suppressed with the increasing time and temperature of air storage. The complete elimination of PESCC accompanied by recovery of elongation to failure from 20% to 38% was achieved after 24 h of air storage at 150–200 °C. It is established that the characteristic PESCC zone on the fracture surface is composed of two regions, of which the first is always covered by the crust of corrosion products, whereas the second one is free of corrosion products and is characterised by quasi-brittle morphology. It is argued that the corrosion solution and hydrogen stored within the corrosion product layer are responsible for the formation of these two zones, respectively.

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“…[23] Localized galvanic corrosion should be avoided when considering developing alloys for bioresorbable applications as it can result in premature failure of the device. [24,25] Following thermal processing of MgRE alloys, a more random texture can be recrystallized, termed the "RE texture," which improves ductility and reduces the anisotropy of these alloys. [26] The origin of the RE texture is not fully understood; however, it has been shown that its appearance post thermal treatment can depend upon the previous processing steps, composition of RE elements in the alloy, and the annealing temperature.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatments on the Microstructure and Mechanical Properties of Two Fine Mg–Li–Y Alloy Wires for Bioresorbable Applications

et al. 2022

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Two Mg–4Li–xY (x = 0.5 and 2.0 wt%) alloy wires are investigated for application in bioresorbable medical devices that experience high levels of plastic deformation. The two wires are supplied cold drawn to a diameter of 125 μm, and a series of thermal treatments are applied to maximize ductility. The ductility of the alloys is maximized soon after complete recrystallization. Prolonged annealing causes grain coarsening in the Mg–4Li–0.5Y alloy and precipitation of a Mg24Y5 phase in both alloys. Both wires are shown to achieve ≈20% elongation to failure in tension and survive high idealized bending strains (>40%). When heat treated for optimum mechanical properties for the intended application, the Mg–4Li–0.5Y alloy develops an intense transverse basal texture; however, this is shown to weaken with increased Y content in the Mg–4Li–2Y alloy wire. The increased Y content also prevents grain coarsening, indicating that the increased Y content restricts grain boundary mobility during annealing. Both alloys have relatively high ductility, meaning both are identified as promising new materials for application in bioresorbable medical devices that require to achieve and support high levels of plastic deformation during their life cycle.

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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

Cited by 15 publications

References 115 publications

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution

Influence of Heat Treatments on the Microstructure and Mechanical Properties of Two Fine Mg–Li–Y Alloy Wires for Bioresorbable Applications

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