A study of long-term static load on degradation and mechanical integrity of Mg alloys-based biodegradable metals

Koo, Youngmi; Jang, Yong-Seok; Yun, Yeoheung

doi:10.1016/j.mseb.2017.02.009

Cited by 30 publications

(6 citation statements)

References 35 publications

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“…However, there are no systematic studies on the mechanical properties of the degradation layer. It appears very fluffy and brittle, 60,63 and it has been reported several times that part of the very thin degradation layer can exfoliate. 64 However, some of the cracks visible in microscopic images may only be drying artefacts.…”

Section: Degradation In Presence Of Cellsmentioning

confidence: 99%

The Interface Between Degradable Mg and Tissue

Willumeit‐Römer

2019

JOM

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Magnesium (Mg) and its alloys degrade under physiological conditions, which makes them interesting implant materials, especially for osteosynthesis and cardiovascular applications. However, how strong is the connection between the implant, the degradation layer, and the surrounding tissue, namely bone? Considering that microscopically the interface can be separated into the border between the metal and the degradation layer, the degradation layer itself, and the border between the degradation layer and the biological environment, it is not obvious that this zone with total thickness of several tens of microns is sufficient to keep an implant in place. However, biomechanical approaches such as push-out tests have shown that a degraded Mg pin is surprisingly well connected with the bone irrespective of the fragile appearance of the degradation layer. This paper provides an overview of what is known about the interface between degrading Mg implants, cells, and bone tissue.

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Section: Degradation In Presence Of Cellsmentioning

confidence: 99%

The Interface Between Degradable Mg and Tissue

Willumeit‐Römer

2019

JOM

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“…For orthopedic and cardiovascular implants, materials are often also subjected to complex stress environments in vivo, including tension, compression, bending, and cyclic mechanical loadings [ 18 , 19 , 20 ]. For example, a bone plate needs to bear certain tensile stress for connecting the fractured bones together [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Microstructure and Distribution of the Second Phase on the Stress Corrosion Cracking of Biomedical Mg-Zn-Zr-xSr Alloys

et al. 2018

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The stress corrosion cracking (SCC) properties of the bi-directional forged (BDF) Mg-4Zn-0.6Zr-xSr (ZK40-xSr, x = 0, 0.4, 0.8, 1.2, 1.6 wt %) alloys were studied by the slow strain rate tensile (SSRT) testing in modified simulated body fluid (m-SBF). The average grain size of the BDF alloys were approximately two orders of magnitude smaller than those of the as-cast alloys. However, grain refinement increased the hydrogen embrittlement effect, leading to a higher SCC susceptibility in the BDF ZK40-0/0.4Sr alloys. Apart from the grain refinements effect, the forging process also changed the distribution of second phase from the net-like shape along the grain boundary to a uniformly isolated island shape in the BDF alloys. The SCC susceptibility of the BDF ZK40-1.2/1.6Sr alloys were lower than those of the as-cast alloys. The change of distribution of the second phase suppressed the adverse effect of Sr on the SCC susceptibility in high Sr–containing magnesium alloys. The results indicated the stress corrosion behavior of magnesium alloys was related to the average grain size of matrix and the distribution and shape of the second phase.

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“…Generally, SCC is related to anodic dissolution and hydrogen embrittlement [ 105 , 106 , 107 , 108 , 109 ]. It is suggested that the anodic dissolution with intergranular stress corrosion feature can be attributed to the micro-galvanic activity between grain boundary second phases and the adjacent matrix [ 105 , 108 , 110 , 111 , 112 ]. The corresponding corrosion susceptibility can be increased by the electrochemical thermodynamic activity, rupture of the surface layer, and dislocations piling up in grain boundaries or internals [ 113 ], accompanied by localized corrosion/pits [ 108 ].…”

Section: Corrosion Behaviormentioning

confidence: 99%

Corrosion Behavior in Magnesium-Based Alloys for Biomedical Applications

Liu

Sun

et al. 2022

Materials

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Magnesium alloys exhibit superior biocompatibility and biodegradability, which makes them an excellent candidate for artificial implants. However, these materials also suffer from lower corrosion resistance, which limits their clinical applicability. The corrosion mechanism of Mg alloys is complicated since the spontaneous occurrence is determined by means of loss of aspects, e.g., the basic feature of materials and various corrosive environments. As such, this study provides a review of the general degradation/precipitation process multifactorial corrosion behavior and proposes a reasonable method for modeling and preventing corrosion in metals. In addition, the composition design, the structural treatment, and the surface processing technique are involved as potential methods to control the degradation rate and improve the biological properties of Mg alloys. This systematic representation of corrosive mechanisms and the comprehensive discussion of various technologies for applications could lead to improved designs for Mg-based biomedical devices in the future.

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A study of long-term static load on degradation and mechanical integrity of Mg alloys-based biodegradable metals

Cited by 30 publications

References 35 publications

The Interface Between Degradable Mg and Tissue

The Interface Between Degradable Mg and Tissue

Effect of the Microstructure and Distribution of the Second Phase on the Stress Corrosion Cracking of Biomedical Mg-Zn-Zr-xSr Alloys

Corrosion Behavior in Magnesium-Based Alloys for Biomedical Applications

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